Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 232
duction by Varying Currents. Fig. 185. 262. Direction of Induced Currents. 263. Strength of Induced Currents. 264. The Induction Coil. Fig. 186. 265. Spark Coil and Electric Gas Lighting. Fig. 187. 266. The Telephone. Fig. 188. 267. Transformers. V. Electric Currents by Mechanical Means 268. The… … 221. Magnetite.—There is found in various parts of theearth an iron ore composed of oxygen and iron (Fe304), whichwill attract small bits of iron. This is called magnetiteto indicate that it is a magnet. It has also been calledloadstone for reasons which will appear later. The smallpieces of iron…
Physics
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