Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 376
1530. PERSPECTIVE CENTRO- — LINEAD.—The edges of legs on the sides a^ b, and c must be in line with their common 11 axis, with clamp screws to hold the movable legs in their set position. The directing pins b and c should be set on the radial lines of the back point of the perspective, when the… … 1531. SPHEROMETER.—For meas-uring the curves of spherical surfaces orof templates of lenses by means of agraduated follower at the centre betweentwo bearings. The scale and nonius arecomputed for the versed sine of a fixedchord length. Section XVIII.MISCELLANEOUS DEVICES. ANIMAL POWER, SHEEP…
Mechanical movements
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