St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 74
galvanometer should 1 e a short-coil astatic one. (See Study, Chapter XXIV., forexperiments and home-made thermopile.) CHAPTER XI. MAGNETIC EPFECTS OP THE ELECTRIC CURRENT. 91. Electromagnetism is the name given to magnet-ism that is developed by eledlricity. We have seen thatif a magnetic needle… … Fig. 89. passes through a wire, the magnetic needle placed over orunder it tends to take a position at right angles to thewire. Fig. 89 shows such a wire and needle, and howthe needle is defledled; it twists right around from its Nand S position as soon as the current begins to flow.This shows that…
Electricity
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