The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 28
hen the perpen-dicular falls without the base. Thus,when the upper portion of the miniaturetower, seen in Fig. 4, is removed, so asto bring its centre of gravity at «, wherethe perpendicular falls within the base,it will require considerable force to over-turn it; but if the top be replaced, soas… … CENTRE OF GRAVITY. 23 height, so as to carry the centre of gravity above Z>, the struc-ture will be unsupported, and fall.* The equilibrium of a body may be either stable, indifferent orunstable. The firmness of a structure depends on the extent of the baseupon which it rests, and the nearness…
Physics
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