American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 99
, so wepass to a consideration of 2d. The polisher may be anywhere from one-half to three-quarters of an inch in diameter,and should not be over three thirty-seconds ofan inch face, and may be made of sheet-iron,and should be turned up when on its own man-drel, running on its bearings. Sd. A… … tance, so that it does not leave the cutting cor-ner too pointed for strength. The angle for thecutting edges should be about 60° with theupper face, and this will be found the best anglefor any purpose where a good cutting or drill-ing tool is sought to be made. The pivot drillshould be ground up…
Clocks and watches
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