The Boston school compendium of natural and experimental philosophy .. (1837)
Parker, Richard Green, 1798-1869 · Boston : Marsh, Capen & Lyon · leaf 58
B than when it is exerted at P.* A balance or pair of scales is a lever of the first kind, with equalarms. Steelyards, scissors, pincers, snuffers, and a poker used forstirring the fire, are all levers of the first kind. The longer thehandles of scissors, pincers, &c, and the shorter the… … weight, F the fulcrum, P the power and the bar,W F P the lever. To raise the weight W to 0,the power P must descend to p. But as the radiusof the circle in which the power P moves is doublethat of the radius of the circle in which the weightW moves, the arc P p is double the arc XV w ; or,in other…
Physics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-322-213.webp)
