A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 516
0 Fig. 264. a way that the current through the galvanoscope can be easilyreversed (see Fig. 264). Read very carefully and record the position of the needle, tappingthe instrument lightly, as usual; then, by means of the commutator,reverse the current through the galvanoscope, and again read… … Tf time permits, after making observations with the shortest wire,use each of the others again in turn, ending with the longest. Take the mean of all the deflections obtained with each wire asthe true deflection with that wire. On a piece of coordinate paper, ruled in very small squares, meas-ure…
Physics
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