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)
alcohol andexpansion of air above it. When the alcohol in the large bulb hascontracted by cold, and then again expanded by heat, the float on theleft hand will be left at its highest point. So, after the instrument has been submitted to different tempera-tures, as, for instance, at some place in a… … 283. Figure 19.—Differential thermometers. — The ob-ject of these instruments is to determine the difference of temperature HEAT. 169 of two different points or substances. The one here represented con-sists of a two-bulbed tube, bent tAvice at right angles; the tube beingpartly filled with alcohol…
Physics · Astronomy
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