A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 348
read (and hence ver-tical) with its zero at b.The height of tlie cen-tre of tlie bullet isfound from tliat of thetop and bottom bytating the mean. Toavoid parallax (§ 25)these heights aresighted through a tele-scope (e), on the samelevel with them. Wethus find the lengthof the pendulum inquestion.… … Fig. 152. 318 DYNAMICS. [Exp. 57- dulum is now to be found. The csunting is to be begunat a moment when the pendulum begins a swing justas the second liand of a regulator (Fig. 152) indicatessome round number of seconds. The time must bewritten down provisionally in advance. Let us sup-pose that…
Physics
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