Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 115
into a cfifferentdirection by a force of known intensity ; (4) by balanc-ing it against the force of gravity as brought into playin attempting to deflect a magnet hung by two parallelstrings (called the bifilar suspension), for these stringscannot be twisted out of their parallel position… … Fig. 55. forces. The main principles of this instrument (as usedto measure electrostatic forces of repulsion) were de-scribed on p. 15. Fig. 55 shows how it is arranged for H 98 ELEMENTARY LESSONS OK [chap, ii measuring magnetic repulsions. By means of thetorsion balance we may prove the law of…
Electricity · Magnetism
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