File:The dictionary of arts, sciences and manufactures embracing in all nearly three thousand articles on arts and sciences (1859) (14767213782).jpg

Identifier: dictionaryofarts02smit (find matches)
Title: The dictionary of arts, sciences and manufactures ... embracing in all nearly three thousand articles on arts and sciences
Year: 1859 (1850s)
Authors: Smith, James, author of the Panorama of science and art
Subjects: Technology Industrial arts
Publisher: Boston, Phillips, Sampson, and Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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of a given measure of it, and the weight of the samemeasure of water, then dividing the former by the latter, andthe quotient will be the answer. In order to fill a phial accu-rately with fluids, particularly corrosive acids, it is advisableto have a glass stopper to it, with a very small channel on oneside ; the phial being filled, and the stopper put in, the super-fluous fluid escapes up the channel, where it may easily bewiped off, and the phial will be left exactly full. Another method of finding the specific gravities of fluids,though not, perhaps, on the whole so accurate as the above, isoften practised : it consists in calculations founded on the dif-ferent weights which the same body will lose in different fluids.The body usually made and kept for this purpose, is a smallglass globe, M, fig. 10, with a pie-ce of platina wire affixed to it;glass and platina are selected, because there are no substances MriDlhl fottTATJKtt aifii. IHI i ,h;M \.l:l,,; c /■/.i/•/•; /. /A ■.
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HYDROSTATICS AND HYDRAULICS. 87 Hydrostatics. Directions relative to specific gravities. conveniently to be obtained, on which so few liquids have anyaction. The experimenter should have the weights of hisglobe, in air and in water, accurately noted down. To havethese ready for reference, he will find very convenient. Lethim now take the weight fo the globe in any fluid, of whichhe wishes to know the specific gravity; and divide the weightlost by the globe in that fluid when compared with the weightof the globe in air, by the weight lost in water when com-pared with the weight in air: thus suppose the glass ball toweigh 140 grains in air, 80 grains in water, and 86 grains inthe fluid to be tried; as the loss in water is 60 grains, and inthe other fluid 54 grains, 54-r60=0.9, the specific gravity ofthe other fluid. The great importance, in many cases, of obtaining thespecific gravities of fluids, not only with accuracy but expedi-tion, has introduced several contrivances to render the

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