Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1796 Excerpt: ...wire r s, it shews that the weights put into the scale e, are just equal to the weight of the body. By this method we sind the absolute weight of the body; the relative weight is found by weighing it hydrostatically in water, as follows: Instead of putting the body into the scale e, as before, let it hang with the weight F, at the hook c, by a horse hair, as at R, supposing the vessel O of water were away. The equilibrium being then made, the index T standing between a and r, at the thirty-sixth division, shews the weight of the body put in to be 1095,36 grains. As it thus hangs let it be immersed in the water of the vessel O, and it will become much lighter: the scale e will descend till till the beam of the balance rest on the support x. Then suppose 100 grains put in the scale d, restore the equilibrium precisely, so that the index T stand at the thirtysixth division above a; it is evident that the weight of an equal bulk, of water would, in this case, be exactly loo grains. After a like manner this balance may be applied to sind the specific gravities of fluids; as is easy to conceive from what has been said. The Hydrometer. THIS is the most eligible of all instruments for sinding the specific gravity of fluids only, as well for cafe as expedition. The globe of the hydrometer should be made of copper, for ivory imbibes spirituous liquors, and thereby alters their gravity; and glass requires an attention that is incompatible with expedition. The most simple hydrometer consists of a copper ball B b, to which is soldered a M' Ębrass wire A B, one quarter of an inch thick. The upper 3. part of this wire being filed flat, is marked proof, at m, fig. 3, because it sinks exactly to that mark in proof spirits. There are two other marks at A and B, fig. 2, ...
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