[Handwork in Wood by William Noyes]@TWC D-Link book
Handwork in Wood

CHAPTER IV, CONTINUED
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Lengths are measured from point to heel exclusive of the tang.

They are classified: (1) according to their outlines into blunt, (i.e., having a uniform cross section thruout), and taper; (2) according to the shape of their cross-section, into flat, square, three-square or triangular, knife, round or rat-tail, half-round, etc.; (3) according to the manner of their serrations, into single cut or "float" (having single, unbroken, parallel, chisel cuts across the surface), double-cut, (having two sets of chisel cuts crossing each other obliquely,) open cut, (having series of parallel cuts, slightly staggered,) and safe edge, (or side,) having one or more uncut surfaces; and (4) according to the fineness of the cut, as rough, bastard, second cut, smooth, and dead smooth.

The "mill file," a very common form, is a flat, tapered, single-cut file.
[Illustration: Fig.149.a.Diagram of a Rasp Tooth.b.

Cross-Section of a Single-Cut File.] _Rasps_, Fig.

147, differ from files in that instead of having cutting teeth made by lines, coarse projections are made by making indentations with a triangular point when the iron is soft.


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