t all across at one in a semicircle is a right angle. Suppose, for example, that standing; then we step sufficiently forward, and carry the Fig. 16 represents a piece of wood having a semicircular planing forward, repeating this until the jack planing is groove in it, and we mark off on the groove… … of the groove. We shall thus find that the two lines struck slide along the board on its edge, there being no contact be- a blade of spring steel, which, by the operation of two screws, will be at a right angle to each other, the two lines, A A, tween the cutting edge of the plane iron and the face…
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