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W hen English soccerstar D avid B eckham bends the ball,the internationalsports w o rld w atches in aw e.W hen A m erican m usician T im Kaiserbends a circuit,the audi-

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32

MAKE Volum e12(page. 14)introduced readers

issueforth asdistcd ed orm odulated sam ples

to Tim Kaiser buteven people who've neveç heard ofhim have probably hearcihis sounds. These m ay em anate from the instrum ents

from one ofKaiser'sAtom ic SonicFx Boxes in the hands ofotherartists. Arnong those em itting Kalsersounds are

Kalserhim selfcreatesandplays.such as BungeeDrumsm adefrom concretepostform s

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B low yourfrlends aw ay as you send thls 25-cent rocket hund reds offeet In the alr. You can bu IId thls easy Iau ncher and rocket w lth co m m o n hardw are store Item s In an afternoo n A IIthe parts for this sim ple but im pressive air rocket and Iauncher are cheap and easy to find.B uilding it is a breeze and the m odifications are endless.It's Iegalin a big city, reusable,clean,and can be Iaunched even in high w inds on a sl'rla IIfie Id . Believe m e,fo lks are quite taken by the 20 0 -to 3 00 -foot flights fueled by 18 o r so bicycle pum ps ofco m presseclair. W hether you're Iaunching o n your ow n or w ith a w ho le group of rocketeers,w atch the crow ds gather ...3 ,2 ,1, an d aw ay 1 . ! C:xt1Tl:7pk:E7.#.pkt7b.ëQ'lJS r'PrJ.ifC1T '

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sirength'andevenatihe75qsiusedforihisqrojed.iiwill

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you could also build ihe eno're sysiem oui ofgalvanirad sieelpipe 2 a greaierexpense.

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D O IN G D O N U T S A sm o ke ring ,or vortex,is a beguiling thing to w atch:a co herent,m oving structure m ade out ofthin air.Llere

are 3 cannons thatcan throw these ''

chunks of air''across a roo m

I'd been aw are ofvo rtex cannons for quite som e tim e, m ostly as an interesting toy,anclafter Ikept stum bling on the concept w hile touring the w eb,Idecided Ihad to build m y ow n .T here's som ething fascinating abo ut taking a substance as ubiquitous and am o rphous as air and transform ing it into a coherentand persistent structure,alm ost Iike a crystal.Ialso hoped to find som e use fo r rrly cannon , perhaps to propelscents org ive the touch of a gho st in a haunted house. A n extrem e exam ple ofthe vortex's ''reach out and touch som eone''pow er is the m ilitary vortex gun,w hich uses explosives to clrive air rings that can knock peo ple over,or at Ieastgenerate enough sound pressure to renderan area uninhabitable.A nd the Shockw ave C annon created by S urvivalResearch Labs delivers an invisible boot to the head .

This projectdoesn'tgo thatfar,butitw illshow you how to m ake 3 differentcannons:a s-m inute version ,a com putercontrolled version driven by a subw oofer,and a pow erful

1 one based on rrly Boom Stick project(MAIL'E,Volum e 13,

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FLA M E O N W itù no m oving parts,this Sim ple energy-recycling generato r scavenges w aste heatfrom a cand le and turns it into usable electricity. Peltier cells are flat devices that clraw heat from one side to the otherthrough a therm oelectric principle called the Peltier effect.The cells are com m only used to pum p heat aw ay from C PLJS or graphics cards,and are also found in cam ping coolers and heaters.T he A m azing Seebeck G enerator uses one of these devices in reverse,to turn a heatdifferentialinto electricity,ratherthan using electricity to produce a heat differential.

Ioriginally m ade the projectbecause Iwanted som ething Iike a steam -pow ered generator,but w ithout the noise and m aintenance issues associated w ith steam .Iw as pleasantly

surprised w hen Ifound thatrrly $5,37-wattPeltiercellfrom eBay could capture the heatfro m a single tea candle or alcoholburnerand use it to generate about 5 volts at 1 am p, w hich m ade it perfect for pow ering radio s,m obile phones, and LED Iights.You can m ake the A m azing Seebeck G enerator in Iess than an ho ur using m ostly scrap or recycled parts,and it has a distinctly steam punk feelto it.

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