Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
will be lowered ^wo-eighths of aninch. As the expansion of brass is twice that ofsteel, the rods, marked 2, will elevate the pendu-lum, by their expansion, two-eighths of an inch ;and thus the expansion or contraction of thebrass just neutralizes that of the steel rods, as in-dicated by the arrows.… … 61. Figure 19.—La^ws of oscillation of the pendulum.— Let the pendulum besuspended at A; then,when it is in the positionN it is in equilibrium,as the action of gravity,which acts vertically,is resisted by the ten-sion of the string orrod. If the ball bedraAvn aside to T, andthen allowed to…
Physics · Astronomy
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