Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 307
great delicacy.The following method, used by General Roy in 1787, and which was devisedby Ramsden, depends on another principle. It measures the elongationsdirectly, and without amplifying them ; but it measures them by means of amicrometric telescope, which indicates very small displacements. The… … Fig. 294. to be determined, and in the two others are cast-iron bars of exactly thesame length as this bar. Rods are fixed vertically on both ends of thesethree bars. On the rods in the troughs A and B there are rings with cross-wires like those of a telescope. On the rods in the trough C are small…
Physics
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