point a, then extend the gaugeto point b, making another line the whole lengthof the block. On the other end make anothersemicircle. This completes the laying out of the corebox The wood must now be taken out just to theselines. This may be done in two ways, the better of whichis by the use of the… … Fig. 40.an acute angle, so as to conform to the shape of the planeat the apex of the angle forming the two sides of the faceof the plane. The principle of its construction and useis, that the greatest inscribed angle in a semicircle is aright angle. The whole of the wood on the inside ofsemicircle…
Patternmaking
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