St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 30
Fig. 29. Fig. 30. taken by a compass-needle when moved about on one sideof a bar magnet. 38. Magnetic Figures can be made by sprinkling iron 28 ABOUT MAGNETS AND MAGNETISM. filings upon a sheet of paper under which is placed amagnet. Fig. 29 shows a magnetic figure made with anordinary bar magnet.…
Electricity
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-84-10.webp)
