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§ 30. The Use of the Compass-Saw, marked Q Plate 4.
The Compass-Saw should not have its Teeth Set, as other Saws have; but the edge of it should be made so broad, and the back so thin, that it may easily follow the broad edge, without having its Teeth Set; for if the Teeth be Set, the blade must be thin, or else the Teeth will not bow over the Blade, and if it be thin, (considering the Blade is so nar∣row) it will not be strong enough to abide tough work, but at never so little an irregular thrust, will bow, and, at last, break; yet for cheapness, they are many times made so thin that the Teeth require a setting. Its office is to cut a round, or any other Compass kerf; and therefore the edge must be made broad, and the back thin, that the Back may have a wide kerf to turn in.