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)
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… … A, is heated more than the other, tlie liquid will be depressed in itsbranch, as at N, and rise, as at T, in the other branch, as indicated bythe arrows, until the tensions in the two bulbs balance each other;and the graduated scale attached to one of the arms will show thedifference of temperature…
Physics · Astronomy
Internet Archive · University of Connecticut Library · Public Domain Mark 1.0. Free to use for anything.
