American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 262
spring chucks are correctonly for one size ; and the opening and shuttingof them to any extent greater than the openingin them as originally constructed, vitiates theircorrectness ; for when distorted, either wider ornarrower, the interior of the jaws do not remainparallel, and the article, if… … lines b the want of parallelism when compressedmore than its normal condition ; and by inspec-tion it is easy to see that a 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…
Clocks and watches
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