. Teacher's handbook of Slöjd . severalstrands of strong string, which are twisted together by atightener, in order to give the required tension to the the string is put on, the frame is fastened between the bench pegs. The stretcher is made of fir or pine; the side-arms of harderwood, , beech or oak. The different parts of the frameare made as light as is compatible with strength, that thesaw may not be too heavy to manage with one hand. Manner of ^TL workinp^, the saw should be holding the ^ , i i n • i saw. .^^ firmly grasped by the side-arm just above the handle. In the case
. Teacher's handbook of Slöjd . severalstrands of strong string, which are twisted together by atightener, in order to give the required tension to the the string is put on, the frame is fastened between the bench pegs. The stretcher is made of fir or pine; the side-arms of harderwood, , beech or oak. The different parts of the frameare made as light as is compatible with strength, that thesaw may not be too heavy to manage with one hand. Manner of ^TL workinp^, the saw should be holding the ^ , i i n • i saw. .^^ firmly grasped by the side-arm just above the handle. In the case of the lighter description of saws, the handle, as well as the Fig. 39. Saw-blade end, lower part of the side-arm, should with attachment. I. be held in the hand, and the index finger should steady the blade. Generally speaking, the blade is fixed obliquely to theplane of the frame; partly that the worker may saw deeplywithout hindrance from the frame, and partly that he maybe able to see the line which the saw is to Tighteningthe bladt. In tightening the blade—which is best done by turningboth handles simultaneously—care must be taken that it isperfectly 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 tha
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