Austin, Louis W. (Louis Winslow), 1867-1932, Thwing, Charles B. (Charles Burton), 1860-1946, joint author · Boston, Allyn and Bacon · leaf 25
1 S UREMENT. Exercise 3. — To measure the diameter of a steel rod. First bring the screw and stop in contact with a gentle pressure. .V uniform pressure may always he obtained by grasping the head of the screw loosely in the lingers, and turning till the fingers slip. If the zero is not found to be… … along the length of the rod. The spherometer (Fig. 5)consists of a tripod, the legsof which form an equilat-eral triangle, with the screwin its centre. The head ofthe screw is enlarged to forma disk, which, if the pitch ofthe screw be J mm., is dividedinto 500 parts. The instru-ment will then read…
Physics
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