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The Guardian Angel Parachute
How a Repelling Arc Regulates Itself
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airplane Alternating Current apparatus attached Auto automobile barograph battery blade block boat bolt bottom brass build cable carried Catalog cent Chicago coal coil color connected construction cost cylinder cymene Dept device diameter disk drilled electric electrical resistance engine factory fastened feet gasoline glass Gulf Stream handle heat hold hole horsepower illustration inches instrument invention inventor iron Labrador current lathe lever light machine meal worms mechanical metal method miles motor operation OTTAWA Patent Pepsodent phonograph picture piece pipe placed plate Popular Science Monthly position prevent protozoa pull pulley radium rope rubber screw Send shaft ship shown shows side soldered speed steam steel Street strips surface thread tion tire tractor truck tube turn Undark valve wheels wire wireless wood wooden Write York City