. Teacher's handbook of Slöjd . y straight. Otherwise a straight cut can hardly beobtained. If the saw is out of use for any length of time, the tightenershould always he slackened. When this is not done the side-arms may become twisted. Bow-saws have different names, depending on the natureof the blade. The hook, , angle of the teeth is shownin Fig. 32. TOOLS. 85 A. The Broad-webbed Bow-saw is shown in Fig. 38. Itsblade is 1 to 1J inches broad. It is usedin numerous cases, , in sawing off longslips of wood, where a straight cut is allthat is required. It has 4 to 5 teethper inch. B. T
. Teacher's handbook of Slöjd . y straight. Otherwise a straight cut can hardly beobtained. If the saw is out of use for any length of time, the tightenershould always he slackened. When this is not done the side-arms may become twisted. Bow-saws have different names, depending on the natureof the blade. The hook, , angle of the teeth is shownin Fig. 32. TOOLS. 85 A. The Broad-webbed Bow-saw is shown in Fig. 38. Itsblade is 1 to 1J inches broad. It is usedin numerous cases, , in sawing off longslips of wood, where a straight cut is allthat is required. It has 4 to 5 teethper inch. B. The Turn-saw (Fig. 40). The frameresembles the preceding, but the blade isvery narrow—about J inch, or very littlemore—^because it is used to produce cur-vilinear cuts. The toothing is very fine—7 teeth per inch—and the setting issometimes less than in the bow-saw, thatthe cut may be accurate, and not unneces-sarily broad. Fig. 40. Turn-saw. Turn-saws, the blades of which are over half an inchbreadth, are also in These are called broad-wehhed turn 2. Saws without Frames. 1. The Hand-saw (Fig. 41) has a very broad blade, whichis narrower at one end, and is provided at the broader endwith a convenient handle. The large blade gives it sufficientstrength, and this is often increased by the thickness of theblade, which may exceed that of the frame-saw. The teethaie set to cut when the worker pushes the saw away fromhim, but not when the saw is drawn back. This saw, distinguished for its simplicity and conveniencein working, is in general use in England and North America,but has only within recent years been adopted in Sweden,where it is now rapidly gaining favour.
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