A FREE PS Savelt Blueprint JohnTom（一个免费的PS JohnTom Savelt蓝图）.pdfVIP

By Harry Walton UST 15 seconds after you light up, this little engine chugs into action. J It will keep going as long as it has fuel—at a lively 1,000 r.p.m. running light, or plugging away hard under any load short of stalling it. Youll fire it up to mystify friends or A FREE jus t to see it go. Its rocker-arm action is fascinating to watch. Dating back to 1816, the hot-air engine PS Save-lt is also one of the latest subjects of re- search. It could be fueled by nuclear Blueprint heat, and a highly sophisticated design, to be powered by solar heat, is proposed for generating electricity aboard space Save the following satellites. four pages for your This simple one, fueled by alcohol, personal project file. Pinch the blue sheets will drive small models, pump water, spin together, gently lift a display turntable, or turn a fan . It re- from the magazine, quires no castings, and involves some in- and tear them loose teresting but not difficult lathe work. Fun from the two staples. The blueprint will to build and operate, its a conversation then lie flat for use. piece for your den or workshop, or a safe but exciting gift for any youngster who can be trusted with matches. 142 POPULA R SCIEN C E A P R I L 196 1 Steps in machining the parts for the air-cooled hot-air engine ALTHOUGH not hard t