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Mechanical movements, powers, devices and appliances; (1903)

Hiscox, Gardner Dexter, 1822?-1908 · New York, The N.W. Henley & co. · leaf 376

An illustration from Mechanical movements, powers, devices and appliances;, 1903, leaf 376 — 1530. PERSPECTIVE CENTRO- LINEAD.—The edges of legs on the sides a^ b^ and c must be in line with their common ~ 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 long… … 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.

Mechanical movements

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