Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 243
large forcemust be very near to the magnetic substance. 230. Lines of Magnetic Force.—Fig. 125 shows how linesof force go out from the pole of a magnet. Figs. 126,127, 128, and 129 show how these lines are affected by theproximity of other poles. These lines of force may bemapped out upon paper by…
Physics
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