ITT. E. GOOPER

Wholesale Lrumber

RICHFIEI.D BI'II.DING, IOS ANGEIES

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Conveniently loccrted to give you personcl senrice cmd the usual highest quclity oI lumber, Ponderosa Pine - Sugar Pine - Dougrlas fir - Spruce

Treated Wood Manhole Covers

2Gpenny nails to each strip, and running at least two /sinch bolts through all members, countersinking both bolt ends. Where it is difficult to secure nails and bolts, Los Angeles officials point out that county and city engineers can use wood dowels and waterproof glue.

The hexagonal cover is 371 inches in overall diameter and is 321 inches between opposite faces. Faces are I8fu inches. Two lifting slots, each 3 inches by /a inches are set in eight inches from the opposite corners. Weight of the metal bound cover is approximately 130 pounds; the gluedin dowel cover weighs slightly less. Lumber requirements total 63.3 board feet of No. 1 common Douglas Fir, and county specifications call for pressure treatment with either Wolman salts or creosote. The manhole cover in the illustration is constructed with Wolmanized lumber.

The six sides of the cover are faced with ty'a-inch plywood when pouring the concrete to give ample space for expansion or contraction between the cover and retainer. Circular covers may be used as inside forms by tacking roofing paper to them for tl-inch clearance.

Preservative treatment of the wood by a pressure-impregnation process is specified.

Wear,and splintering of the wood is reduced by laying the laminated strips at a 45-degree angle to the.line of traffic, applying a thin coating of bitumuls or emulsified asphalt, covered with dry sand or pea gravel, to the top surface of the wood cover, keeping the surface of the cover flush with the roadway.

Items Of Interest

Treated wood manhole covers have been designed as an emergency measure to replace cast iron, the development of which was supervised by Alfred Jones, Los Angeles county surveyor and engineer, and C. F. Arnold, deputy chief.

Faced with the urgent necessity of building many miles of sewer line to assure healthful living conditions for thousands of incoming war industry workers who have settled in the unincorporated areas, county officials designed a pressure-treated wood manhole cover and concrete frame that saves approximately 500 pounds of metal, the amount normally required for a metal unit.

The cover is made w:rth laminated wood strips fashioned in either hexagonal or circular shape. Plans call for nailing the 2-inch by 4-inch by 8-inch laminated strips with four

George Young, Friend & Terry Lumber Co., Sacramento, recently returned from a fishing trip on the Smith River, Del Norte Countv.

Leo Hulett of Hobbs Wall Lumber Co., San Francisco, did some steelhead fishing on the Eel River, Humboldt County, around the first of the month.

R. E. (Bob) Caldwell, Hammond Lumber Company, San Francisco, made a round trip by plane to Portland to attend the lumber auction and meetings in that city at the end of October.