Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 250
trument is constructedfrom the principle that a hair elon-gates when moistened, and shortenswhen dried. The form usually givento it is shown in Fig. 154. A hairabout eight inches in length is fast-ened at its upper end, and at itslower end it is wound around theaxis of a small pulley, and then… … the hair elongates and contracts. Fig. 154. To graduate the instrument, it is placed under a bell-glass, and(he air is thoroughly dried by some substance, such as quick-lime,which is capable of absorbing the moisture of the air. The point atwhich the needle then stands is marked 0. The air is then…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
