Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 149
t the side,and terminate at the ends of the horizontal cross bar whichis loaded by weights placed in the scale pan at the centre.The angle of twist is read in degrees by observing each end K 130 SOUND CHAP. Ill of the needle over the graduated circle which is providedwith an anti-parallax mirror.… … Fig. 39.—Rigidity Apparatus. W.Q Then the tension on each thread is ~ dynes and the couple 2r times this, i.e. mgr-G dyne-centimetres. Further,d° = (nd/lSO) radians, or 0 = 7rd°/l80. Hence from equation(4) or (5) we obtain for the rigidity of the material undertest, 360r/r I m 7r- (v a 83…
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