. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. THE MOUNTING AND PROOFING. 159 larger diameter, than the metal saw, the teeth beingalso set rather strongly to give clearance for the blade. The metalsaw is generally of athicker gauge, smallerdiameter, less set,and more teeth (there-fore finer teeth). Awood saw will pro-bably have not morethan four to six teethto the inch of cir-cumference, whilst ametal saw will haveeight to ten. Thesmaller the diameterand the finer the teethin a metal saw thebetter. The circularsaw is not only usedfor str
. The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass. THE MOUNTING AND PROOFING. 159 larger diameter, than the metal saw, the teeth beingalso set rather strongly to give clearance for the blade. The metalsaw is generally of athicker gauge, smallerdiameter, less set,and more teeth (there-fore finer teeth). Awood saw will pro-bably have not morethan four to six teethto the inch of cir-cumference, whilst ametal saw will haveeight to ten. Thesmaller the diameterand the finer the teethin a metal saw thebetter. The circularsaw is not only usedfor straight sawing,but a good dealof trimming maybe done on it inthe case of vig- P- netted or shapedblocks. Fif?- 92 For cutting out spaces in the interior of a picture the jig saw(fig. 92) is used, as well as for difficult places—. i6o THE HALF-TONE PROCESS. round, shaped, and vignetted blocks. The jig saw is,however, a machine which is least needed, as we havealready pointed out that the circular saw will do a greatpart of its work, whilst a hand fret saw will do theinterior spaces, or, better still, the routing machinewhere available. The shoot plane is an indispensable tool in smallestablishments where a beveller and trimmer is notwarranted. Fig. 93 shows the usual form. It consistsof an iron bed-plate with a channel at the side, in which
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