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T H IS JA Z Z Y .C O M P R ES S E D -A IR P O W E R E D W H IS T LE S O U N D S A M IG H T Y B LA S T. D ecades ago,w histles w ere used in factories,on railroads,and aboard ships.

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A ccordlng to the N ationalLibrary ofW ales,Adrian Stephens of South W ales invented the first steam w histle in 1833.Stephens w as em ployed at the Dow lais Iron W orks,w here he devlsed a steam w histle as a w arning device forboilers.T he steam w histle idea took hold,and by 1860 w histles w ere installed in factories al1across Europe and the Industrialnorthern states ofthe U nited States.The w histles w ere practicaland econom ical, and soon the stearn w histle w ent m oblle,blaring outw arnings at railroad crosslngs.

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M U S IC O F T H E S P H E R E Solar cells gracefully Iink technology w ith the Earth's naturalresources,bring ing projects out ofthe dank,dusty w orkshop and giving them a sustainable hom e w ith th e p Ia nts o uts id e .T h is a uto n o m o u s xylophone uses S olarengine circuits and pentatonic chim es to p lay in tune w ith that big nuclear pow er p lant in the sky.

W ind chim es capture w ind energy to m ove m etaltubes that generate sound w hen they strlke one another,T hey're sim ple, tim eless,and beautiful.You can neverpredictthe com posltion the chim es w lllplay afterthe nextgustofw ind,w hich is w hat m akes these inventions so com pelling .T he elegantoverlay they add to ourexperlences brings us closerto nature.

Iw anted to create a different kind ofautonom ous m usical instrum entthatw ould ,Iike w ind chim es,generate tones from a naturalresource.So Im ade this solarxylophone,w hich gives

voice to the silentsun and takes the project(and ourselves) outside.w here w e belong.It uses eightsim ple,independent system s to strike its eight chim es in parallel.So you can Iose the pow ercord and forgetthe batteries,but be sure to bring yoursuntan Iotion.

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T V rem otes use infrared Iight for com m unication w ith the T V set.Every infrared rem ote uses A A orA A A batteries to pow eran infrared LED ,controlqed by an electronic circuitthat beam s com m ands according to the buttons thatyou press.

T hls electronic circuit is a very Iow -pow erdevice.N onetheless.every so often the batteries get drained.usually rlght w hen you need them m ost.A nd w hat happens to the used batteries? Perhaps yo u send them to your Iocalbattery recycling plant,or m aybe they end up in yourtow n's Iandfill, polluting the environrcent.ltw ould be very nice ifw e could use our rem ote controldevices w ithoutany batteries ataII! Itturns out that it's easy to bag the batteries,as Iong as you're w illing to putin a Iittle m anualeffort.H ow aboutsim ply m oving your hand back and forth a few tim es? T his m otion represents kinetic energy thatcan be converted into electrical energy,sufficientto pow erany rem ote control. ) é S et u p: -

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