Chicago lesson 7 by Watchlords Inc

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LESSON 7 Selecting tT Mainspring Sections 185- 200

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MASTER, WATCHft1AKING A tlodarq Complcle, Praclical Covrsc CHICAGO SCHOOL OT WATCI{MAKING Founded l90t

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All these things are essential but your knowledge has little value unless applied to a mainspring that is suited to the watch you are working upon. Not always will you find the old one of proper size and you must be capable

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Sections 185to lO0

Seleeting the Mainspring

the preceding lessons you have Section TT "";;;'learned the importance of replacI r{r!' ^ ittg set mainspflngs, the necessity of using good oil and how it is applied, the more popular forms of tips made by manufacturers, and certain- tests that are used in Ioeating errors in winding caused by either broken or improperly attached mainsprings. You have been shosvn the proper methods of placing mainsprings in watches without distorting them and have been irnpressed r*,ith the importance of using a good winder in yorlr work.

Lerson 7

of judging by its appearance in the barrel whether it is of standard dimensions and if wrongr to select one that is right. Should a broken mainspring as it lies in the barrel, appear to be of correct size it is best to replace it with one of the same dimensions as to width, thickness and Iength, and with the proper tip.

Sec. 186 Dennison TAp" of Gauge Your first step then is the selection of a. good mainspring gauge. ?he one illustrated in figure

145 has been standard for a long time, but in recent years mainsprings are being gaugedmore and more by means of the metric system with its measures of greater accuracy. Sec. 187 * Width This gauge in figure 145 consists of a plate with notchesof varying widths around the edge. In gauging for width, the mainspring is tried in these until one is found in which the flat side of the mainspring will just fit" If it will enter the notch marked 18 when held flat against the gauge, but will not enter 17 we consider the mainspring 18 wide by this system Sec.188 - Strength The thickness or strength of a mainspring is shown by the tapered slot at A. Push the mainspring, tip end first, through the hole at B, and lightly press down in the slot until it stops and note what figure is opposite the lower edge. This figure will give you the strength. In listing dimensions from this gauge the width and strength are often shown with an x between as follows: 19x5 meaning that the mainspring is 19 wide, by 5 strength. This type of gauge is not always accurate. ?he difference between each succeeding notch is approximately one tenth of a millimeter, number 1 being one millimeter wide, number 2 one and one tenth millimeters, number 3 one .and two tenths millimeters (1.2mm), number 11, two millimeters * number 21, three millimeters, etc. In some watches mainsprings are used with a width of lO:Yz,713/4or l9Yz according to this method, but with this gauge there is no way of measuring such widths accurately. The slot for measuring the thickness becornes worn and even on new gauges there often will be found a variation, if comparisons are made between given positions on the scales. Again the numbers on the slot are confusing in that the larger the number the smaller the actual measurement, number 5 on the thickness gauge measuring about .18 mm while number 10 is eguivalent to .11 mm.

Sections 189 and 190

Lesson 7

MASTER WATCHMAKING

per with vernier capable of measuring to 1/100 mm and the finest and most accurate of all, when properly madeo the micrometer caliper in hundredths of a millimeter, which can be used in measuring dimensions of staffs, pinions, wheels, pivots, jewels, mainsprings and which should be found in everv Master Watchmakers set of tools. Sec. 190 -

Sec. 1E9 -

Gauging bg the Metric

Sgstem

The metric system was rendered Iegal for all transactions in the United States by an Act of Congress, approved July 28, 1866, and is now legal or obligatory in all commercial countries. In many parts of the world including Europe, more metric measurements are in use than any other system. The metric unit of length for watchmakers is the millimeter, or one thousandth of a meter, and this is being used more and more in the gauging of watch parts and material. One inch equais almost exactly 25,4 millimeters. The diameters of pivots are gauged in hunfuedths of e millimeter as are the holes in jewels. The outside diameters of balance jewels and train jewels are gauged in tenths of a while roller jewels are gauged in millimeter hundredths of a millimeter. All faney watch glasses or crystals are gauged in tenths of a millimeter and many manufacturers of round ones are also gauging their products in tenths of a millimeter. Ttrere are several types of metric gauges that are used for different purposes, such as the pivot gauge divided into hundredths of a millimeter; vernier slide caliper for inside and outside diameters, combined with a depth or shoulder gauge, measuring in tenths of a millimeter; the degree type of gauge, or spring cali-

The Metric fuIicrometer Caliper

In figure 147 is shown a popular type of metric micrometer caliper. The spindle D is attached to the thimble B and they turn as one piece, the spindle passing through the sleeve C. The sleeve C is fastened to the frame E and remains as a fixed part of the frame. Part of the spindle is threaded to fit threads inside the sleeve. When the thimble is revolved to the left it causes the spindle to recede from the anvil A and when turned the other way the spindle advances toward the anvil. The piece to be measured is held between the anvil A and the end of the spindle D. The spindle is then brought against the piece by turning the thimble R. This should only be turned as far as it will go with a light pressure. Memorize these parts: A-Anvil B-Thimble C-Sleeve D-Spindle E-Frame The amount of the opening is indieated by the lines and figures on the thimble and sleeve. The thread on the concealed part of the spiudle is of such a pitch that one turn advances the spindle and with it the thimble, one half or 50/100 of a millimeter. The short vertical lines on the sleeve correspond to the pitch of the thread. The upper series of these lines indicated by N touch the horizontal line L as shown in the drawing at figure 149 and indicate the millimeters. The lower short vertical lines at P are half way between the upper lines N and indicate the half millimeters. Every fifth line of the upper series is longer than the rest and numbered, 0, 5, 10 etc. These numbers indicate the number of millimeters when the thimble is opened to this point. The beveled edge of the thimble at M is marked with 5O divisions, every fifth division being numbered from 0 to 45. Knowing that one whole turn of the thimble rnoves the 6pin-

Lessott 7

MASTER WATCHMAKII:{G

dle lengthwise 50/1U) of a millimeter it follows that turning the thimble t/5O of a complete turn or the distance from one division line to the next on the thimble will rnove the spindle 1/50 as far or 1/l0O of a millimeter. Sec. 191 -

Reading the trIicrometer

A little practice will enable ;*ou to read your micrometer on any sized opening up to its capacity.. Start by turning the spindle until it

Section 797

is against the anvil. The beveled edge of the thimble then should be even with the zero line on the sleeue and the zero line on the thimble should coincide with the hortzontal line L on the sleeve. Occasionally you may find that the anvil and spindle do not come together on account of there being dust between them. If your lines do not coincide as described above, draw the spindle away from the anvil and insert a clean piece of watch paper, then turn the spindle until the paper is held but can be withdrawn without tearing. After pulling the paper out, without releasing the spindle, no doubt you will find that your caliper registers correctly. \Vhen rneasuring with a micrometer caliper alu'ays bring the anvil and spindle together u.'ith a light tr)ressure. By using und.ue force it is easy to spring the tool and ruin it for accurate measurements. For this reason the beginner will get better results by having his micrometer equipped u'ith a ratchet stilp and thus get the same amount of pressure at all times. Having vour micrometer caliper closed to register at 0, open it by giving one full turn of the thimble until tlre O on the thimble again registers on the horizontal line on the sleeve as illustrated at figure 150. Notice that the heveled edge of the thimble now coincides with the first of the lower series of vertical lines on the sleeve, indicating one half or 50/100 of a millimeter usually written .50 mm. (see figure 150). If you turn the thimble two full turns from the anvil until it is even with the first of the upper series of vertical lines counting from the 0 line it indicates one millimeter, written 1 mm. (see fi gure 151). When the horizontal line on the sleeve does not eoincide with the 0 line on the thimble it is necessary to add the extra hundredths indicated. In fignre 152 the thimble is a trifle past the 2 millimeter line and the 33 Une on the thimble coincides with the horizontal line on the sleeve this showing exactly two and thirty three hundredths millimeters, written 2.33 mm. In figure 153 the thimble is dra.*'n out still further. Here it is past the line indicating 6.50 mm and shows .44 on the thimble, Adding 6.fl) and .4.1 gives 6.94 mm. The pitch of the spindle thread on the micrometer shown in figure 146 is coarser and one turn of the thimble moves the spindle exactly one millimeter instead of one half millimeter as in the other. On this spindle there is but one series of vertical lines, each line being one millimeter apart.

Seefiorrs192 to 194

Lesson 7

WATCHMAKING TUIAST'ER

On the thimble there are 100 divisions,each division indicating one one-hundredth of a millimeter. Thus if you back the spindle from the anvil one full turn it will have move<l exactly one millimeter. The drawing at figure 154 shows the difference between the two methods of indicating the same measurements. The drawing at 154 shows 6.94 mm by this system and figure 153 shows 6.94 rnrn by the other system. Figure 148 shows much the same type of micrometer as figure 147 with the addition of a ratchet stop and lock nut. The ratchet at H rvill slip rvhen more than a certain arnount of

pres$ure is applied on the spindle and rernoves the danger of springing the tool. The lock nut at K enables you to lock the micrometer in any position. A satisfaetory way to hold the micrometer is shown in figure 155. Here the frame is held against the hand by the seeond finger leaving the thumb and first finger to manipulate the thimble. ' Sec. 192-

Metric Wid.th

In measuring a mainspring to find its width in millimeters the outer coil is held between the frame and anvil as shorvn in figure 156 and the thimble is turned nntil the mainspring is heltl with slight pressure, after whieh the reading is taken as explained before. The measurement for the metric width is expressed in millimeters and for this particular mainspring it is two and eighty three hundredths millimeters or in decimals, 2.83 mm. Set. 193 -

fuIetric Strength

To obtain the strength or thickness of an old rnainspring it is sometimes necessary to straighten a portion of it, especially if it is set. Otherrvise the curved part lying betrveen the spindle and anvil, will give a higher reading than the actual strength of the mainspring. By holding the spring between the fingers as in figure 157 it is possible to straighten out enough of it to gauge the actual thickness by applying the micrometer caliper to this straight portion. It is seldom necessary to take the measurements on new mainsprings especially for American watches, as in the better grades, each one comes packed in a separate envelope with the Dennison and metric measurements plainly marked on the outside, but you may have occasion to measure new ones for Swiss lnovements or to cheek up on American sizes and it is possible to follow this same procedure without injury to the springSec. 794 -

Lengtlt

The length of a mainspring determines the number of coils in the banel. If your mainspring is of correct thickness and length, it will oceupy the proper space in the barrel and will have the right number of coils. The average watch should have 11 or 12 coils in the barrel and these coils should occupy one half the area between tbe arbor and the outer shell of the barrel. If vou will exam-

Lcssott 7

MAST'ER WATCHMAKING

ine the photograph in figure 91 lesson 5 you will see there are almost 12 coils counting from the tip inward toward the arbor. Some of the finer R. R. movements are fitted with longer and thinner mainsprings having more coils, yet occupying the proper arnount of space in the barrel one half the area between the arbor and the outer shell -- this giving a longer running period on one winding. A very good example of this type is shown in figure 134 from a Bunn Special Railroad movement. This mainspring with nearly 14 coils occupies one half the area between the hub and the outer shell of the barrel and is known as a 60 hour mainspring. Sec. 795 -

A Rule to Remember

One of the rules applying to the mainspring is that in order to obtain the greatest number of turns the length and strength should be such that the occupied part of the barrel outside of the arbor is equal to that of; the unoccupied part; in other words a mainspring should occupy one half of the area between the outer diameter of the arbor and the inside shell of the barrel. Some watchmakers apply this rule by dividing the radius into three equal parts, giving the arbor one third, the unoceupied part one third and that part occupied by the mainspring, one third. This rule applies fairly well as far as the arbor is concerned as you will find it is generally just about one third the inside diameter of the barrel - in the majority of watches being

Section 79lt

under rather than over this proportion, but the distance from the arbor to the inner shell of the barrel should be divided into two equal areas, when comparing the open space with that of the space occupied by the mainspring, and the area of these two equal spaces are not contained as equal radial measurements. In figure 158 I have drawn two circles inside an outer circle in order to divide the radius A B into three equal parts. This however does not mean that the total space, enclosed by C is equal to the total space betn'een the circle C and D or that the space between C and D is equal to the space between D and E. As a matter of fact as the diameters increase the areas increase. In figure 159 the circle F is the same size as C in figure 158 but the circle G divides the space between F and H into two equal areas, that is the area of the space between the circles F and G is the same as that of the space between G and H. If the heavy circle H were to represent the shell on the wateh barrel and the eircle F the diameter of the arbor, a properly fitted mainspring will exactly fill the space between G and H when entirely run down and in like manner occupy the space between F and G when wound tightly around the arbor. You will find that the diameter of the circle G representing the inner coil of the mainspring when run down is almost exactly three fourths the diameter of the circle H representing the inside shell of the barrel.

Section 796 to 198

Keeping this in mind it is an easy matter to tell by the appearance of a mainspring in the barrel whether it is of corect thickness, provided you know how many coils it should have. By knowing what proportion the mainspring should occupy you can figure out its proper strength for any barrel. In like manner, knowing the strength of a given mainspring it is possible to figure how many coils should be in the barrel to give the best results. Sec. 796 -

To Calculat'e Strength

Here is a sirnple rule that will give you the approximate strength of a mainspring with any given number of coils where you have the inside diameter of the barrel and the diameter of the arbor. (a) Subtract one half the diameter of the arbor from one half the inside diameter of the barrel (AB rninus AC figure 158), (b) Take 38Ya per cent of this difference. (c) Divide the result by the number of coils desired and this will give proper strength of mainspring to give most turns on the banel. Let us take as an example barrel shown in figure 140. The inside diameter

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is 15.5 mm.

The diameter of the hub, (F in figure 159) is 5 mm. Number of coils 12.5 (d) Subtracting one half the diameter of the arbor (2.5 mm.) from one half the inside diameter of the barrel (7.75 mm.) we obtain 5.25 mm. (e) 381/+per cent of 5.25 mm. gives 2 mm. (f) Dividing 2 mm by 12.5 (number of coils) gives .16 mm as the proper strength for a mainspring for this movement. Sec. 197 -

Lesson 7

MASTER WATCHMAKING

To Calculate Number of Coils

Given the strength of a mainspring number of eoils.

to find

(S) Divide 381/E% of space by strength of spring. In the above barrel if the mainspring we wish to put in the banel is strength .16 mm. Divide 2 mm (e in sec 196) by .16 mm eguals

12T2,number of coils for best results.

Sec. 798 -

Som,e Interesting Eaperiments

The majority of watchmakers have their own ideas as to the amount of space that a mainspring should occupy in a barrel but few knorn' the correct method of determining this space and what the proper proportions are. You will find that a great many go on that idea of one third of the space on the radius as explained in section 195. The watchmaker of an investigating turn of mind will get some rather interesting results if he will go to the trouble of making a few experiments on an ordinary grade of watch. He will find that some factories provide their watches with mainsprings that are too long. In order to overcome friction and poor adjustment on these movements it is neces$ary to provide springs of goodly strength and in doing this they apply a stronger spring of the sarne Iength as the weaker springs on higher grade movements. In my work of instructing I have made various experiments and have shown where more turns of the barrel often could have been secured by shortening the mainspring. At A figure 160 is a barrel from a 16 size 7 jeweled American watch with a 16 size mainspring as recommended by the manufacturer of the movement. This mainspring is .20 mm thick and would be accepted as the proper size by a great many watchmakel:. The unoccupied space on the radius of the barrel is about the same as that covered by the mainspring and as I have said before, this is the rule that many watchmakers use in determining whether the mainspring is of correct strength and number of coils. Experiment

If we compare this portion however to the drawing in figure 159 we find that the urainspring is occupying altogether too much of the barrel. In experimenting with this mainspring barrel in the movernent, I found that by winding it up as far as it would go and then allowing it to run dolf,'n, the minute hand made ffi2/5 revolutions or if we could imagine that the watch would run as long as this with its escapement in place, 3S hours and 24 minutes. Experiment B. I next took this mainspring out of the barrel, broke off 33 millimeters from the outside end, put on a new tip and wound it into the barrel as shown at B. Replacing in the movement antl winding up as before, it ran down with 37 2/3

Lesson7

MASTER WATCHMAKING

turns of the minute hand. Here you see the mainspring was &3 millimeters shorter and yet ran an hour and 16 rninutes longer. Experiment C. Again I removed the mainspring and hroke off N millimeters from the end and replaced in the barrel as shown at C. Upon winding this mainspring and letting it run down it showed turns amounting to a trifle more than 38 hours.

Section 798 contftmed

ExperimentE. The portion of mainspring shown at E, 25 millimeters shorter than D. ran 37 hours and 5E minutes. Experiment F. F, 25 millimeters shorter than E ran nearly the same as E, 37 hours and 52 minutes.

Experiment D. Next I broke off ?.5 millimeters more and the mainspring appeared as in D. When this

Experiment G, Finally I broke off 50 rnillimeters more making the mainspring at G 50 millimeters shorter than F yet it ran down showing 36 hours and 42 minutes.

lvas wound up and allowed to run down it showed 38 hours and 14 minutes, a gain of nearly two hours over the full length mainspring shown at A. If you will examine the proportions shown in D you will find that they approach very nearly our ideal shown in the drawing in figure 1.59. I continued breaking off portions of the mainspring and testing them with the train in the movement with the following results:

Comparing figure A rn'ith figure G -vou should appreciate the fact that having a longer mainspring does uot always make the watch run a greater length of time. Here in figure A we have the full length mainspring which gives turns amounting to 36 hours and 24 minutes. At figure G the same mainspring after breaking off a large portion and then having been wound up so many times that it began to show the effects on the inner coil, which is set, gives more turns than in A.

Sectiort 198 and 199

KIASTER WATCHMAKING

ExperimentH. Taking another new mainspring of the same make and the same strength as the one used in experiment A, I broke it off at the point K, thus dividing it into two parts as shown at L and M, the portion L being about 18O mm. or a trifle over seyen inches long. I then placed a tip on the end of portion M and wound it into the barrel as showu at H. Placing this shorter mainspring in the movement and winding it up completely I found that it made turns equivalent to 37 hours and 2 minutes before it \ilas completely run down. Here again, is demonstrated the paradox of making a mainspring give more turns to the barrel by taking off a generous portion. It would appear as though much of the part L of this mainspring was of little value in the watch as we get better results by using the part M alone. Comparing the results of this short mainspring with the complete mainspring used in the barrel at A, we find that this short one ran 58 minutes longer than when using the entire spring. If we substitute a weaker mainspring of about the same length, \n'e may expect a greater number of turns as a result of winding it up and letting it run down. What we gain in turns however, we lose in power. Thus it is that the finer the workmanship on a movement in a given size the Iess the strength needed in the mainspring to give a proper motion to the bala n c e. Exp er im ent N. In this same movement I placed a mainspring with a thickness of .16 mrn which filled the barrel as shown at N figure 160. This spring you will observe has only a fraction more than the number of coils in the stronger spring shown at A but comes nearer to occupying the ideal space in the barrel. On account of the better proportions of space and mainsprings we should expect this to give more turns on the barrel than any of the previous mainsprings. The result of winding and allowing it to run don'n gave a number of turns equal to SlYz hours. Experiment O. Breaking off 31 mm, which gave approximately one coil less as shown in O, gave the number of turns equal to 53% hours, a gain of nearly two hours. Another test was then tried with No. 0 by placing the balanie and escapement in the

Lesson 7

movement, winding the mainspring up to its limit and allowing the watch to run in one position until it stopped which it did in 51 hours and 58 minutes, this lacking about 1% hours of running as long as it did when there was no resistance to the train. Experiment P. As a further test I broke sff At mm more as shown in P and allowed it to run down which it did with a number of turns equal to 52Yz hours as compared with 53/3 hours with O. Here it is evident that I have broken off a trifle too much, and the mainspring occupies less than one half the actual area between the arbor and inner rim of the bamel, and does not give as much power as with the length shown at O. You should now see the fallacy of thinking that because a watch does not run as long as should be expected, it has a mainspring that is too short. There are probably more mainsprings by a large majority of a greater length than is necessary than there are mainsprings too short, being carried in watches today. From these last three experiments you might get the idea that all that is necessary is to keep reducing the strength of the mainspring and the watch will give better service but this will not prove true. The power needed is determined to a great extent upon the condition of the movement. Thus it is that a 2l jeweled grade uses a weaker spring than does a 7 or 15 jeweled movement made by the same manufacturer. l.[ot only do the extra jewels reduce the friction in the train but in the higher grade movements the escapements are matched closer. It is not customary to break off the end of a mainspring in order to get the correct length for American watches. As a general rule you will find that solne manufacturers have a tendency, especially in the lower grades, to use springs of too great a length, but it will hardly pay for you to change the length of every one you put in. The better way is to put each one of your repair jobs in such good condition that a weaker mainspring will make the watch motion properly. Sec. 199 -

Choosing a Mainspring f or An American Watch

Before taking any mainspring from its barrel examine carefully to see that it occupies the proper spase, has the correct number of coils and that the uppeledge of the outside coil

Lesson 7

MASTER WATCHMAKING

come$ a trifle below the shoulder in tbe barrel where the cap snaps in place, this showing the proper width. Remove the mainspring and gauge it for width and strength. Notice the type of tip and then from the mainspring chart you should be able to select the proper mainspring for that rnovement. On the following pages you will find descriptive charts of mainsprings for eleven different American made Watches. Some of the factories making these movements have gone out of business but as long as these watches continue to be brought in for repairs it is necessary to list mainsprings to fit them even as it is necessary to list those for discontinued models made by the more successful factories. In these charts the various types of tips are illustrated and this will help you in selecting a mainspring to match any particular one. Following the style column is given the company's number, then the siae follorved by the column giving the description of that particular mainspring or the movement for which it is intended. The next two colurnns give the Dennison width and strength as found by the gauge shown in figure 145. The columns designatedas Width Metric and Thickness Metric are the ones to be used for those using the metric system of gauging. Under the Width ll{etric Column are shown the widths of the mainsprings in millimeters and in the next column are shown the Strengths or Thicknesses in Millimeters, usually in hundredths and occasionally in thousandths of a millimeter. Suppose that a 16 size Hamilton Watch is brought to you and you find it needs a new

Sections 199 and W

mainspring. How will you go about selecting a new one? After seeing that it fills the proper proportion of the barrel, remove and measure its width and thickness. You find that it has a T end and mea$ures285 mm. wide and .19mm. thick. Looking on the chart, under Hamilton, 16 size, you find that number 355 in the first column is the one needed. In like manner you can find the proper spring for any American Watch. Sec.2O0-

Carrging Mainsprings in Stoek

Broken mainsprings are among the most com'\{'atchmon replacements made by the Master maker and it is of the greatest importance that he shall have a fairly complete assortment on hand in order to grve his customers prompt service.It is not necessarythat this should cousist of a great quantity of each size nor that you carry every number listed on our charts. Generally you will find that certain makes of watches are most popular and your stock of mainsprings should be heaviest on these lines. You can purchase assortments already made up in sizes to suit nearly every purse. By purchasing an assortment you are able to buy at the dozen or gross price which makes quite a saving as cornpared to the cost when only one mainspring is selected. The cost of good quality mainsprings is so small compared to the retail price for replacing them in watches,that it does not pay to buy the cheapestquality or job lots. The cheaper mainsprings nearly always will be found of inferior quality and the few cents more profit wiII hardly make up for the loss of a good crlstomer when such a mainspring "sets" in his watch.

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2t30

Mutcl t007 ..

ett

Model1900.,'. 8

t22 rel 1 2 3e t24 t25 126 t z T _G t3l r32 -t

tB6

7t4L $r{L, Rect...

t288

TtiL Rectrngular..,

9Yz

2221

2226 t235

1 6 E 6/0 Mod. 1898 t.E s3 6/eMod. lsl2

2239

t0L Tcn Ligner.. .

2?l.S

s . N . & P ^ S. .

eI. 1 D l 3M o d e l . . , 2 t 1

2D39 6t4L 0r'ol

, l3 { u 2 12

285

2r ?.50 .22 2t ?.90

300 3.?5 230 ?80 280 2.10 250 2.t5 ?.15 r30 r30 ?30 r,q0 r.90 ?.r0 r70 r.?0 r50 ?fr6 t,55 r50 130 r.50 r.08

,22 2 l . l g 25 .22 2 l .t9 25 . r 8 25 .21 l9 ,22 t9 .15 l 9ti . .15 l 9' /. .175 l 9 .r05 l9'1. .21 l9 ,2r t 6 .t9 l 0 ,15 l6 .r65 l 6 .13 l 5 .15 l 6 J2 l5 .15 .t2 ,13 JO .t0

t4'1, l3t/g l3t/s l0tl,, lo t/.

1.10 .08 9 130 .l l t2'1, r.t0 .09

Co.'s No.

STYLE

No.

.sj'.'

DESERIP. TTON

|.';{

?66

3e g! si Eg I

fiilt

t 5 18 l S t o t t J . . .

3N 2.85 3t4 2.85

L32 1 8 Motor Barret

I8 Motor Barrel

{

t0 3

016 5

s3{ t 0 Motor Brrrel r!9S t l [totor Barrel I530 0 l,arlyHnm. , r$s 0 Motor Benel I ?21 6/0 l7J 232t 0/0 17J 263I ti/o 979Model. t ? . ) r t8/0 0!'(L 0rnl.

€

3 t 8 t 0 t 7 t r. . . . . . 'lJ 3 1 7 l6 l0 to

t 6 l 8 t7J

Wm '

e N

s .l J

6 2

7t4 8y] t)/: !14 l!

3, lo 3.20 2.85 2.85 2, 75 1. 70 1.40 1.40 1.30 1,40 1.40 t.l0

AVOTAgO

)ennlson Qur No.

STYI,E

co.'8 No,

o N

DESCRIP. TION

rt h

rul

400 402 404 406 407 ffiw-rysl 405 409 {08 @ffiq 4 1 0W 411 412 413 4 t 4 -f 4t6 t19 @Fn 4t7 I@

w ffi

53 l8 t 0 t 4 2 3 J . . . . . . . 20 53 It

U p t o 1 7 J ., . . . . .

86,: 1 B O l d M o d e l . . . . . , .r 0 57t t6 N . M . ! o 1 7 J . . . . . l8 57t l 0 N . M . t 9 - t 3 J . .. .

12,1l 0 N . M . ,W i d e . . .. . 20 175! T A 60 Hour,

l95i l 0 I t l o t . B a r . . . . . . . .t7 123t l 2 N e w M o d e l . . . . . .n r8'r$ t 3 t r l o t . B a r . . . . . . , r053 l 2 M.B.ThichModel l7r 6 08t 0 t422 0/0 358t2/0 2,N2$/a longue End

t It I 8 3 3 3

t g

f,tt

.205 .20 .t8 .19 .,19 .lg .16 .18 .15 .t.15 . 135 ,[2 . tr 5 .09

€f !r F*

2,90 2.qa 2.50 2.70 2XA 2,90

25tlt

27 22 22 20rle t4 l4 1lr/r

,2V2 . 22 2 ,72 3 .205 ttA I .lg 4 ,t9 0),6 3.m . 1 6 6 2,70 . 1 8 2.00 . 1 9 4 5 r.40 . l g 2.00 . t 7 6 1.80 . t 8 6 r.70 . t 4 8 rJ0 . t 3 0 ew 1.20 , 12 r 0 1.20 .ll SYt

22 22 25r1,

2l t/t 2ltlt

20 20,1, 20tlt ?orlc 2 7t l t 22'lt l8'/t l8'/: 18t/r t4 l3 l0% 9rl^

IUAINSPRINGSFOR AMERICAN WATCHES

ELGIN

WARD

Aver130 )ennhon Our No.

STYLE

Co.'s No.

o N

Deacrlptlon

a ltl

B 221 202lffi

293lEr 20t

tEr

4a57

E I

5 # !E

I tt f;

37 8 D r y . . . , .

8!t

l8 l 7 J

812

l8 ? h lnJ,.

mfii 4.63 ?.90 2.q0

fr 3s !r

tilil

.24

,n5 2lrl, 23

2l ' 1,

8l'

t 8 2l to r3J..

wt 2.90

.22 21rlt

200 2U 206

1966

l8 Sloel Bancl

8t?

l0 l7 to 211..

817

l 0 7 ta 15J,.

t? l7

190 ?b5 I sh 2b5

.18 25r1, t9 2trlt ,205 2ltlt

207

?t1tr

l 0 Eted Barrcl

208 2W

l7t2

t2 Etccl Bs$d

t720

12 W i d e . . . . ,

210

430

l2 Nanor,..,

2il

,874

l 2 Thin Modct

212

821

6 l6J _. _.

2r4

826

0 Narow

215

20e?

0 Stide..

2t6

20D7

3^ n n

222

r78S

1/( Legiomeirc

217

2706

6lt

218

IEPO

2t9 220

?tr00 tst?

o^ ItJ l0/(

l8x

{

18N

riJ

2b4 223 223

.19 2l .t9 .t9

20 20

n6 {

?b5

t65

.18 20'1..

J.90

l7t/t

127

t65

.14

l6'/t

r.65

.r35 lO r/r

711 8 l0

{

6/l

t.90

EN t25

.ll

15'fi

.t3

l0t/r

t25

.l t5 I t ' [

{ {

l0 10

L25 r25

.l 15 l l r / r J l 5 9t/r

Averag:e )ennlson

Our No.

sTYr-xl

lo.'E No,

N a

DESCRTPTION

I I

600 -t 602 -I 603 604 E 605 -l 606 IEI

rul

l8 O l d M o d e l . . . . .

3rt l 0

fl3J. NerModol..

ilt ilr

gt !i

ttril

t/6 2.80 18 0 2.70 tg

825 t 0 l9J. NowModcl. , .

12 t7"2lJ. Nov llodd

69,

*! ti

653 l 2 l?.21J. Nor Model a16 7 ?OE 10 Togue Hod. .. ..

20 l7 2,70 r 8 r . 90 1 5 r . 75 l 5 1. 50 t 5

23'ls 2t '1, 2l 19,/s t9

INGERSOLL MODELS a vrrEl;t

D€nnisot

Our

STYI,E

No.

Co,'r No,

cr t{ tt2

DESCRIP. TION

r{ E

654 650 651ry{ 652 653 655 -

€f t*

3{4

l 0 Trcotou.

386

l 0 lng. Trtolon.. .

..,

EI E!

* rt € E ! ilfi iln r6 rw 2.40 ,225 l6

1365 l6 Iu3. Relinco,.

2305 l6 Irrg. Rcliruor. .

3 1 6 l2 hg. lTtidtbry.

0335 6/l Alden.

l7 tlt l9 1 7r l t

2,40 2.00 2)A 2. 10 t.60

.20 .23 . 21 ,15 .15

€ # !E

r€ $i iE

t8'6 le%

SETHTHOMAS Avbrtse D€nntson

Our No,

STYLE

Co.'r No.

$ N U'

Detcrlptlon

I E !

70r 702

B 680

t8 ler Stylc.. .

n9 l8

lcot,, widr..

L t

5* ilT

it trl

3.30 . lg5 3.30 .22

2t't,,

MAINSPRINGS FOR AMERICAN WATCHES

EV Y

AY€T&F€

Deunleoi Our No.

STYLE

500 -t 501 502 -t 505 504 513 nf 506 507 5 1 4 -l 509 m 5 r0 5lt H 512 515 H 5 t6 -f

ril

E H

Co.'e H No. a

DESCRIP. TION

I E a, t 9

F 2lEs l8

Reg.Model..

u00

Nos Model..

It l6

ROCKF

STANDARD

Exdriol ...

t6 Ttin Hoalil..

r6t4 2

l82l

flan

r6k 6

$4{

Modd "8"

{28{ 12 ModclK.. 1823 t2 flrpn ?m0 t0 M o d d K . . E Re& Model

0 l1 6 l0

ilt{

0 Ner Modol

6Bit

0 Nqr Modet

l3t$

000 Crorn. . . .

l8t{

to/o Crona..

ilfi

2,45 2,45 2 1,90 ilr.t 1 . 8 3

6 8N 1N 5 t

2,w

1,50 1.90 1.90 1.50 | ,60 t.20

.22 .18 ,22 .20 .lg .16 .185 .18 .15 .t5 .{B

Our No.

STYLE

Co,'g No.

DESCRIP. TION E

550 551

EI g

552 553 8@ 554 555 g

5 Ir E

21 8X

II?Efi l 0 l o t M o d e l . . . . . .

1752{ l6 l u i l M o d d . . . . . . .

55S2r ll

8[fi

0 lrtllodd,......

g?,.N 0 t r d U o d c l . . . . . . .

l0 tN

flttn

!r EI

F iit||t

2,97 .195 i 2.59 , 1 8 6 2,82 . l g 8tt t.98 .175 1r1 1,88 .185 1,65 . 1 4 t

lssfi l8 rd urd 2nd Model

l*U0ds1.......

sr Sg

Co.'r .! l.io. q)

STYLE

DESCRIPTION

{)

t U)

ril

450 45r 452 -f 453 n:0

0{{

IESEModel

822 l6

Ne* Modcl

032 I 8 Ncw Model t077 0 let Model.

ll 8

€f 5i

fitn

2,90 3n 2,70 6t6 2.00 1. 70 I 2

FL vf, tI tl

= r F

'lrlt

.22 22 .20 2A,lz ,172 l 8 % .14 13%

x'1, 20 l9

r8 l9 16'/. t6rl" l6 l5 t3 9 t/r

SOUTHBEND sYer&gc Dennteor

Our NO,

trrtrl

zw .23 20 rr.6 3.00 .23 20 2r4 2.30 .2t5 D'1, I 2,50 .22 2A'h

lCI

3100 33r9

Now Model..

$f !r

6 v ti a'tli t

Dennleor (i

Fg 2trlc Zotlt 2t rl,t t9 l6'/r l3%

H Averare Dennison

Our No.

Co.'-o NO

STYLI'

o N tn

DESCRIP. TION

a! I

301 300

u g

302 303 304 305 306 307 mc 308 E 30q rl 3r0 n 3il G 3r2 -! 3r3

nf ffi

1096 IE 1 7t o r u . . . .

2090 t6 Model1800..

309e l0 !i Plato Mod

8690 l6 {6t7 t0 !0s7 l 0 0090 12

l8 r8 r8 I

Prt. Brrel.. Prt. Barrel. . 7 t 0 1 7 J . ,,,.

s o

13690 tz Paul Rev*e. 8696 0 ? to tSJ.. . . 3101 9690 6lAl i t o l 0 J , . , .

614 5 8t/2 0 6N 8N

15006 8lo /M*y Jane.

3N I

11090I t,'0 6r6L n".b;;.;.

3 t

,. IJooepbine.

t* lt'n

1686 IE 7 to 15J.

BridgeMod..

5 # !s

t0 1t

Ir Tg Ei

ilrn

2.90 . 2 3 2 l t l q 2.90 .205 2l t!. 2.90 2. 05 2.61 2. A5 2. 7Q r .80

,19 .20 .lg5 .t8 .t8 .t8

2t'1.2l tlz 2l 2l 2t tlt 18,/u

1 . 3 5 .172 l 9 1 . 7 5 .165 l6'1, l.{5 .t6 t3 1.23 .t4 Stlr r.20 .ll 9'1.1,00 .0q

cHrcroo tctfoot or wa?cxn^:tila

ITAINSPRINGS

FOR AMEBICAN

WATCIIES

-tr:_r_El_g-

NU VI GOR

. s r z Eqg-No.[.u,foen yl?IH srR. LEr{grHutpTtt srR. LEr{crHFllp gEsclJ3il0}f

F O R : ELGIN 8 cAY t*57 75 r8 8..2 76 t8 812 77 r8 8t2 78 r8 8f2 79 18 1956 8l 18 t955 8o

202 20 305 305

16 16 16 15 15 15 16

6r6q 8t7 8t7 9tl 817 zsLz 25li'2

,25 82 83 84 85 86 87

204 t7 l7 t7 t7 t75 t74

t2 t2 l2 a2 t2 t2 t2 t2 i2 t2

t7t2 r7t2 tTza tTzo 2339 2339 2139 28t4 2874 287$

B8 13 89t34za 13 9o t3 9f 9zil4*ao 93il420 94il3t2o 957i20+ e5 7 977420+

t0 r0

5725 5n6

t27 t26

6 6

824 8?4

99 98

f0 f0

o 825 o 8e5 3/o&02097 3lo8oza97

r00 r0l r02 t03

4716 4q16

4to 4ta 4/o

4789 4789 4789

r04 t05 to5

l0 to r09

5/ o 5lo

2705 2705

107

3*e 3*&}

6to 6t0 6ta 6lo

zSgo 2890 2890 2890

370 20

roB

r@ il0 I ll il2

2.9) . tg z.60 . rBj 2.60 , t9 2r* z.60 . r95 2t]t _ z . 6 o . 2 o 2l 2.60 . 18 z.60 , 19 2l

6zz 5l+6 545 545 545 53'

r* 4

20 za

508 s . 8 , 508 s . B . 508 D86tl 508 DEefr 508 DBETI 508 DBEfi 508 DBE+I 5 t 4 DSSH 5 t 4 DSEH 5 1 4 DBETI

tl* l+ 3; 3*

24+

iil

2.26 2.26 2.26 2.26 2.oo 2.00 2.00 1.60 r.6o t.60

. r85 .r9 . t85 . t9 . r85 , r9 . tg5 . t8 . t85 .t9

5r3

D86tl DBgH DBEfi DB6H DBsH

2r t5 7 7

JLS.)r8S FULLPtirE JLS.)l8S t PLATEr.'rrH J L S . ) G O ' XB GA R R E L JLS.) .

o a

t .

. . . 4 . 4 . . 4

HOOK HOOK

2t JLS.)l8S f, rUrr urrn

DBEH DBETI DEetl DBefl DBETI

GRADES 5t1 rl{RU575 lilCLUSlvE 2 | JLS.)ALL165 ll@ELS t 7 - t 9 J L S . ) l , , l r HG 0 l x G t7-r9 JLS,)BARRELS 7 - 1 5J L S .) t 9 J L S . ) A L L1 6 5U l l H S T E E L BARRELS I7 JLS.}SAFETY

S. 8 . 5.8.

SAFETY BARRELS 19 JLS.)STESL

. . . . . . . . . 1 .

. .

a . . .

r . . . .

f,roDELS 7- r5 JLS.)2rDe3RD 7 JLS. )nrTH STEELBARRELS 15 JLS.)zilD e 3R0 f.roDEtS 7 - 1 5 J L S . ) U | ] HT H t NG o r N G

?.Jll:..l?lllElf

rg JLs.)4T!rlroDEL t7- 19 JLS,)STREAT{LrNE AND r7 JLS . )C oR S IC A N

zof

t7*

t7t

r.65 .t5 r.65 .t7

t*j 445

Dssr{ 086fi

r7-2r JLS.)5THe 6THHoDELS | 5 JLS. )U rTH GOrXG BARREL

6 5*

t7l17*

I,90 .17 l,90 .t75

Irt+5

0Bstl DB6H

7 - t 5 J L S . )l s T s 2 r { D 7-r5 JLs.)I{CDELS

l.3o 1.30 1. 6 5 | .65

406 406 4t9 4r9

B8E}I DB6H

7 - 1 5 J L S ). l ST 7-t5 JLs.

0gefi DBSH

7-r5 JLS.)2[0s 3RDr{o0Ets

|.90 .rI f.90 .t2 f.9o .t3

qoo 400 400

DESH t 7 J L S . ) I S T t ' l @ E L S DBaH 7 - r 7 J L S . ) v r r nG o r N G DEEH 7 JLS. )BARRELS

rol ro$

f .25 .t, 1. 2 5 . t 3 5

27t 273

DEsH DB6H

15 JLS.)rST i{0DELUSED t5 JLS.)0nr-vtx ennost80 1 5 J L S . )t s l S 2 l r D 7-r5 JLS.)t{ooELS 7-15 JLS.)

#?*i&

t+.6t z.9o z.9o 2.9A z.go 1.90 3.90

737 546 545 546 546 6l{8 6t$

29 2t* 2t* 2.* 2l* 25* zS*

.Zj . 2| .2t5 .22 .23 . t7 . 18

r0 9*

ili tl

3+ to 3* e+j 7* ro

.t5 .t55 . tl+ . 145

f45

7 JLS.

) t i l T H G O I N GE A R R E L S

lti

t.25 1,25 1.25 | !25

.095 . t0 . il .t25

292 292 292

z9_2

08sH 0Bttl DBIH 0Bstl

t.65

.t I

304

D8&tf t5-r7 JLS.)tST H@EL

il*

I ti,

l.JLir...l

gta

lzl

t0lo t957 t0l0 t957

I t5 I l3 il4

3* t*

rl t0

93 9t

t.a5 t.zs t.25

.10 .ll .125

2m 2,48 ztrg

DBerl DBsll D3sll

tr-17 JLs,) rsT |{oDEL 7-r5 JLS. )4Tnc5*t frOELS 7 - 1 5J t S . )

tSla ,550

tz3

fa }

r.z7

.l I

3| I

DBstl

t7-21 JLs.) rST I{OEL

2OlO 50r5

il9

2t2

l.lo

.09

2|0

DBet{

t5-t7 JLS.)tST lt@EL,ovAL

2t t0 ,327 2t lo snt

t22 tz4

ri ilt

g* 7-tl8

t.28 t.2,

.095 .095

241 t87

26t0 5ttl

t20

t.ro

.08

2t0

DBEI| 7-t5- t7 JLS.)rSTr{008[ il(DELt{tlH DB0H t9 JLS.)4TH BARRELS GOING DBelr 7- l7 JLS.)ISTlroDEL

5u9 ro/0 t957

3i- e+"_9 i

f 0/0 sf zE ilAtlrsPRlilGsGEilERALLV r{Ay 8E USSDFoR t6l0 AilD t8l0 STZES

58 2357-l

}IAINSPRINGS FOR AIIEBICAN WATCHES !IETRIC

llu v I GoR

iluf,{BER flDTr{ sr,2gq9.N0 FOR:

sTR. LEil0Tt{ I.J IDTI{ STR. L€I'IGTHEllD

DESCRIPTIOil'

HAMILTON

tr* tt

tt r8 f8t5a26 t5 18 15 18 18 232

225 228 1j27 229

r9 tg 22

t6 53t8 f5 3t7-t18 t6 tt7-t|8 t6 3t8 f6 ,34 f6 5t+

252 2rl 230 2n 2t5 231+

6t 2t f9r2l 19421 f94+2l f96tr22 t9 6* 8 6 5

2' l9

t2 t228-to28 216 ,2 &2. 250 t2 e38 3'28

3f ,21 52'

,' 5 6l

25 2l

,.25 LEo 2.80 2.E0 3.10

,185 ,20 ,e05 .2,5 .18

635 ,,' 5'' 5'3 6u

H00K TEE TEE TCE ltr

2t*

3.oo .155 2.80 .18 2.80 . 19 2.80 . t95 2.t0 .t65 2.80 .16

t97 533 5" 533 5t9 5S9

f{8 rlE TET rEE !$ lrB

2l+ t& 18*

l.7o l.n l.ls

. 4 7 5 SIro lll 438 0s .l? . 1 5 47A H9

t{0081 9928

ltooEl ggz !r$EL gg2 REGUI.SR tt@ELs 9l7,9Zt ,923 lloDEt too

0 0

1536 1535

239 240

;t rf il

| ,ll5 | .Il 5

.145 3'6 .145 t56

TEE tt8

|{DEL 98t,983 H@EL985

6to 6la

262t 252t

245 ZI*

5eiil* ,9Lil*

l . q 0 , l 1 5 292 f . l r 0 . 1 2 2n

TEE TEE

iloEL 979 r{ooEls g87A,g87s,gg7, g87F,gn

6/0 6/0

2321 t72t192|

243

5e+il*

| .Ir0 .125

292

TIE

iloDELS986A,g87E

241

1.40 .r35

254

TEE

a,looELs 986,988

8/a

72?t

253

rr{ r}+

r.5o .095

l*8oB

tTlo

4128

246

1.20 ,125

368

tbta

502t

249

4r0il*

tglo

272t

247

tz*

| . t0 .085

ZT9

TEE

2tlo 2t lo

7t'U 292t

254 2I|8

5 I

14 8* t3*ro

f .40 .07 t.00 .075

zr6 254

ToNGUE lrooEL750 - t7 JEIIELS lEE r{o€ts 997,995,995A,ft1

2210 622t

251

t,+* 7t

t.40 .065

t97

t:$

2.98 .21 2,go .22

5t2 rtE 552 TEE

2.go 2.65 2.65 2.65 2.65 2.65

. lg .155 . t8 . t85 . 19 .20

552 546 5'3 ,31 533 53t

rE[ r{oDEL r8t0" HOLE BRACE TTE r{oEL 1902 TEE iloDELf902 rEE |r@ELr9m

.t5 ,t7 .t8 ,175

470 47O 470 qg3

TEE TEE TEE rsE

lr@tl rgto iloDELr9r0 f{0DEL 19r0

r{i

t{oOELS/+7,7t18

TEE

I{0DELt+01 lfoDELs g8o,g82

r.lo .rl

f,to0El 989

I{0DEL9l I

FOR: HAMPDEN r8 .696 371 18 t686 t70

243 242

f5 16 t6 16 t6 f6

20 t86 185 18 t84 f8

I+

2t+ 2t* 2t 2t 2t 2t

t2 7696 38ll t2 7696 385 t2 669t--769,6 378 t2 t2696 ?79

g 9 9 5

7 6 5 5*

t8* t8* t8* 19

|,80 t.8o t.8o r.35

8696

16l

t.8o .t7

4t3

TEE

ALL J€UELS

3/a

9696 38|

t.lo

.16

330

TEE

H. START(.oI ADE}I

8la

15696 382

t.zo .t4

2t0

TE€

H.JAIIE-JOSEPH I XE

nla

I t6 9 6 3 8 3

9-t lt6

| .20

230

TE€

ALL JETT|ELS

2695 ,@7 \@7 3696 3596 3@6

372 377 376 375 t74 ,73

380

t+l

. r0

58 2351-2

MAINSPRINGS FOA AMENICAN WATCEES T{ETRIC t{u vr GoR SIZE CO.NO NUI{EER I'IETH STR. LEI{GTH T{IOTH STR. LFilGTT silD DESCR!ril(r'l # -

- * - * - -

foR: HOVARD r8 f8

55 55

446 rA5

20 19

1 3

4* 23*

2-9a .21 2.80 .21

597 597

15 f6

tzg 329

r*7 448

tg 18

6 5

zt* Zt

2.70 Z.7A

.t7 . 18

5t+6 HoLE TEE 53'

t2 t2

552 553

l*g 450

7 5*

lg* t9

t.go |,80

.t5 .t75

495 483

HoLE TEE

796

451

t0 9 6

l.5o

. 15

406

Tor{cuE

ILLINOIS rr730| 295 47302 296 47t03 297

zo ZA 20

3* 3 z

2 tl 2 t* zt*

2.90 2.gA z.go

.20 .21 .zz

546 rEE 546 TEE '46 TEE

oLD tit0.5, tsT T0 6TH l,loogls oLD t{0.53 tsT T0 6T1l HoDEtS oLD X0.5' rsT T0 5THhOELs

47309 298

3.00

.t55

686 r{B

4733' 305

2a4t

2.90

.20

521 TEE

473t4 299

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FOR: INGERS0L HATERBURY t2 t2 tt6 942 FOR: NEV YORK SfANDARD f8 2t89 l2o 20 585 f8 2r9O 586 2s r20

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58 235?-4

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58 2357-5

MAINSPRINGS FON AMEBICAN WATCHffi

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58 2357-6