Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
as 253 to 204; or, the sp. gr. of alcohol is 204divided by 253 = .809 +. 116. Figure 20. —Specific gravity ofliquids, continued—Hydrometer.—The hy-drometer is an instrument by which the specificgravities of liquids are ascertained from the depthto which the instrument sinks below the surface.It… … HYDROSTATICS. 93 Within the tube is a printed graduated scale. The scale is madethus: the instrument is adjusted to sink in umter, up to the point,say, midway from the ball to the top of the tube. This point is marked1 on the tube (water being the standard), and above and below thismark others are…
Physics · Astronomy
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