American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 236
served on its face, the spiral flutes give thenecessary acute angle for the upper surface.All bow drills, whose edges are ground on bothsides, and consequently act in both directions,are made on the principle of Fig. 7, and theiraction is one of scraping, and not of cutting. In slide rest tools,… … parallel planes; the edge of the tool must beapplied to the work in a plane passing throughthe centres of the lathe, and parallel to theplanes of the slide rest. If we suppose a sliderest tool to be placed in the position of thewood-turning tool, as in Fig. 6, if a cylinder Wasbeing turned the tool…
Clocks and watches
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