. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ^Xty^^^U /7i \h. q In general the angles of the points of the sawteeth are more acute, the softer the material tobe sawn, agreeably to common usage in cuttingtools; and the angles of the points, and those atwhich the files are applied, are necessaiily thesame. Thus in sharpening saws for metal, the file is generally held at 90 degrees both in the horizontaland vertical angle, as will be shown; for very hard woods at from 90 to 80 degrees, and for very softwoods at from 70 to 60 degrees, or even more acutely. The vert
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. ^Xty^^^U /7i \h. q In general the angles of the points of the sawteeth are more acute, the softer the material tobe sawn, agreeably to common usage in cuttingtools; and the angles of the points, and those atwhich the files are applied, are necessaiily thesame. Thus in sharpening saws for metal, the file is generally held at 90 degrees both in the horizontaland vertical angle, as will be shown; for very hard woods at from 90 to 80 degrees, and for very softwoods at from 70 to 60 degrees, or even more acutely. The vertical angle is about half the 3235 represents in plan and two elevations the saw-teeth that are the most easily sharpened,namely, those of the frame-saw for metal, commonly used by the smith : the teeth of this saw are notset or bent in the ordinary manner, owing to the thickness and hardness of the blade, and the small sizeof the teeth. 3237. The smiths-saw blade, when dull, is placed edgeways upon the jaws of the vice,and the teeth which are placed upwards,are slightly ham
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