. Practical physics. V AL IE I0 271. Electromagnets This page shows in tlie upper right-liand corner a photograph of the first electro-magnet. It was constrncted at Princeton in 18_8 l)y Henry. He wound the armsof a U-shaped piece of iron with several layers of wire insulated by wrappingaround it strips of silk. Tho main illustration is a huge modern lifting magnetwhich itself weighs 8720 pounds, is 5 feet 2 inches in diameter, and can lift asingle flat piece of iron weighing 70,000 pounds. It has 118,01X) ampere turns, andcarries 84 amperes at 220 volts. The coil is built np of several pancak
. Practical physics. V AL IE I0 271. Electromagnets This page shows in tlie upper right-liand corner a photograph of the first electro-magnet. It was constrncted at Princeton in 18_8 l)y Henry. He wound the armsof a U-shaped piece of iron with several layers of wire insulated by wrappingaround it strips of silk. Tho main illustration is a huge modern lifting magnetwhich itself weighs 8720 pounds, is 5 feet 2 inches in diameter, and can lift asingle flat piece of iron weighing 70,000 pounds. It has 118,01X) ampere turns, andcarries 84 amperes at 220 volts. The coil is built np of several pancakes of cop-per straps, the turns of strap being insulated from one another by asbestos ribbonwound between them- The magnet is loading a freight car with pig iron, of whichits average lift is 4000 pounds
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
