American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 242
shank of the tool. Theangles are in this way preserved. In considering the shape of the tool, the firstthing to be determined is, whether a single ora double-edged tool is to be used, and thenext the construction of the tool, so that itmay bo applied in the right direction. Indouble-edged tools the… … in Fig. 15 the point of the tool is at A and theslope at B; in Fig. 16 the point at C, and theslope is C D. A large number of tool-holders have at differ-ent times been invented, most of them claimingto secure all, or at least some of the theoretical advantages. Holtzapffel has described a num-ber…
Clocks and watches
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