Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 138
,.instrument employed to ascertain the weight of different t1-1 ! •-substances. It con-sists of a bar MN,which turns freelyabout an axis C sus-pended from a fixedpoint; the substanceQ to be weighed, isplaced at one endA, while a constant weight P is placed at a suitable point B, towards the… … from which Q X AC = P X OB, BG = -|- X AC; 1U NATURAL PHILOSOPHY. or, if P be taken equal to one pound, then willB 0 = Q x A 0. The scale of the If Q be taken suc- Bteelyaid • -, -> , -. constructed. cessivelj equal to 1,2, 3, 4, &c. pounds,then will the corre- Fig. 58.
Mechanics · Acoustics · Optics
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