Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 49
ence between thesereadings equals the distance. The vernier is a device for help-ing the eye to read tiny subdivisionsof a given scale. It is used onmany instruments of precision. Theprinciple is very simple. A definitelength, say an inch or a centimetre,is divided into ten equal parts. A second… … Fig. 12.—Cathetometer. IE u_ in i i I i i i i i i i i i i i i i i i: ■ i i ii i i i i 12 3 4 5 6 Fig. 13.— Vernier, set at zero. MEASUREMENT OF MATTER 33 scale will overlap those on the shorter scale by just onetenth, as shown in the diagram (Fig. 13). Suppose, now,that the initial marks on the two…
Physics
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