American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 262
small object held inthe jaws thus closed, will be free at its rear toassume a position out of truth. The same con-dition of things transpires when the interiorsurface of the jaws take the position a a, andthe object is held by its rear end, allowing thesame liability for error. Another source of… … of some peculiar forms. If the angle of thefemale cone, Fig. 2, is greater than the male, thepressure comes entirely upon the rear of thechuck cone, leaving the nose of the chuck un-supported at its outer end ; and consequently ina measure free to suffer distortion from the line of collimation,…
Clocks and watches
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