American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 233
d with the principles whichcause tools to penetrate. As we have said above, every cutting edge issimply a wedge, whose edge is formed at suchan angle that, by the aid of the power appliedbehind it, it can penetrate into the substanceacted upon. The comparative amount of oppo-sition which a face of… … side, as In Fig. 2. It will be seen, in Fig. 1,that the action of the wedge is the same,whether it is made with one or two bevels.This is the general action of wood tools. Fig.2 shows the action of paring tools, to whichclass lathe tools belong.
Clocks and watches
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