Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 83
Fig. 88. 256. A Leyel Surface is presented by a liquid *Practically, a little difference is noted, due to capillarity. LEVELING. 73 at rest. This is not a plane, but since all parts are actedupon by gravity equally, it must be curved to correspondwith the earth. 257. Leveling is the process of… … Fig. 89. surface of the liquid in the two tubes, a straight line is foundwhich reaches the staff held by an assistant, and the truecurve can be calculated from this.
Physics
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