American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 237
of the upper plane with the two side planesproduces the cutting edges A B and A C, andthe intersection of the two side planes producesthe angle B C A, which is called the plan angle ofthe tool. It is by the proper inclination of theseplanes to each other that we obtain the neces-sary acuteness of… … the shaving. A greater or less inclination ofthe upper plane U, if the tool rests in a hori-zontal bed, produces a greater Or less acute-ness in the cutting edges. II the upper planeis horizontal, the cutting edges will be 90°,whatever be the plan angle of the tool. If itis not, then the angle of…
Clocks and watches
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