American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 261
254 AMEEICAN HOROLOGICAL JOURNAL. … For polishing those that require flat headsthere are two modes. The smaller screws are,for this purpose, run into the nose of the chucka, Fig. 10. At a dis-tance of about threeinches from it, is anupright hardened steelroller, b, its edge, c, inline with the surface ofthe screw-head. Againstthis…
Clocks and watches
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