Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 322
Roy in1787, depends on another principle. It measures the elongations directly,and without amplifying them ; and it does so by means of a micrometerarrangement, which indicates very small displacements. The apparatus (fig. 314) consists of three parallel metal troughs about6 feet long. In the… … Fig. 314 three bars. On the rods in the trough A there are rings with cross-wireslike those of a telescope. The rods in the trough B carry the object-glassesof telescopes of which the eyepieces and cross wires are in the tubes on therods in C. The troughs being filled with ice, and all three bars…
Physics
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