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 29
for instance, the force required at first is consider-able, but gradually diminishes as the centre of gravity rises andapproaches the point directly overthe point of support, where theequilibrium of the body becomesindifferent. Many amusing toys for childrenare constructed, illustrating thecentre… … * The leaning tower at Pisa has an elevation of three hundred and fifteenfeet, and an inclination from the perpendicular of 12.4 feet; and yet standsfirmly, since the perpendicular, let Ml from its centre of gravity, comes withinits base. What form of structure best insures permanency? In turning…
Physics
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