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] Pendulum, Kater's Reversible Compound. A compound pendu- lum, first used by Kater in 1818, for the determination of gravity. It consists essentially of a metal rod, weighted at one end, so that the centre of gravity is much nearer one end than the other, and having two knife-edges, one at either end. In addition, there is some method of adjusting the periods to equality when the pendulum is suspended from either knife-edge. Pendulum Level. A plumb level. [6, 24, 25, 27. ] Pendulum, Mercury, G...raham's. A compensated pendulum in which the ball or " bob " is a cylindrical glass vessel con- taining mercury. When the temperature rises the rod and stirrup expand downwards, lowering the centre of gravity ; but the mercury, expanding, rises in the cylinder and pro- duces an inverse effect. Pendulum Myograph. An instrument for noting, by means of a smoked glass plate forming the bob of a pendulum, the amount and duration of the contraction when electricity is sent through a muscle. See also Myograph.
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