. Teacher's handbook of Slöjd . a couple of pegs. The edge of the trying-plane is often used instead of thestraight edge, and two trying-planes instead of the doublestraight edge. See further under face planing, p. 136. D. Tools used for cutting up AA^ood andmaking the articles. I. Saws. The saw is an indispensable tool, and in the case of mostarticles it is the first used. The hlade is made of thin steelof various breadths, on one edge of which a series of sharppoints form the teeth. The stee] must be soft enough to beacted on by the file, and to admit of the teeth being slightlyturned aside
. Teacher's handbook of Slöjd . a couple of pegs. The edge of the trying-plane is often used instead of thestraight edge, and two trying-planes instead of the doublestraight edge. See further under face planing, p. 136. D. Tools used for cutting up AA^ood andmaking the articles. I. Saws. The saw is an indispensable tool, and in the case of mostarticles it is the first used. The hlade is made of thin steelof various breadths, on one edge of which a series of sharppoints form the teeth. The stee] must be soft enough to beacted on by the file, and to admit of the teeth being slightlyturned aside without breaking off. The saw acts by tearing or cutting the fibres of the woodas the teeth of the blade pass over them. The teeth are,therefore, the characteristic part of the saw, and its efficiencydepends on their form, size, and quality. The shape and size of the teeth vary considerably indifierent kinds of saws. The form generally used in woodslojd is shown in Fig. 82. The form of the teeth is that of 78 HANDBOOK OF Teeth of a bow saw forripping. I. a scalene triangle, the baseof which is formed by theblade. The shortest sidefroms an angle of 80°-90with the base. In the framesaw (Fig. 37, B), the angle Form aiidposition ofthe teeth of
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