Aviation engines; design--construction--operation and repair; (1919)
Pagé, Victor Wilfred, 1885-1947 · New York, The Norman W. Henley publishing co. · leaf 158
hers will remain indifferent to the magnetic force.Experimenters soon learned that of the common metalsonly iron or steel were magnetic. If the ordinary bar or horseshoe magnet be carefully Magnetic Influence Defined 159 examined, one end will be fonnd to be marked N. Thisindicates the north pole,… … Iron Attracted by Magnet,Forms of Magnets. Bar S Simpl N. Horseshoe
Airplanes
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