Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 243
V:.:h Fig.. 126. Fig. 127. moving a small compass around in the vicinity of magnetsplaced as in the figures. By means of the compass needle MAGNETS 221 we get the lines in three dimensions of space, rather thanin the one plane alone of the paper. We shall learn in the chapter upon Current…
Physics
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