American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 275
bor, similar to that for otherwheels, with the division plate upon the otherend. There are three steel cutters for roughingout, and two sapphire cutters for finishing. Thefirst cut is made by a steel cutter, in the shaperepresented at a, Fig. 5 ; b is the mandrel inwhich the cutter is secured ; c,… … 7 gives the form of the third cut, which com-pletes the tooth, giving the proper angle to theimpulse and repose planes. For giving the finalfinish to these two planes, sapphire cutters areused, ground with the greatest care to the cal-culated angles, leaving the surfaces exquisitelyfinished. The…
Clocks and watches
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