A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 125
ation when the dimensions andweight of the rod and balls are known.If, now, two large balls A and B arebrought near the smaller ones, as inFig. 56, a deflection will be produced by their attraction, and thesmall balls will move from a and b to a and b. By shifting thelarge balls to the other side… … bb b Fig. 56. — Plau of the Torsion Balance. It is not necessary, nor even best, to wait for the balls to come to rest.We note the extremities of their swing. The middle point of the swinggives the point of rest, and the time occupied by the swing is the time ofvibration, which we need in…
Astronomy
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