Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 279
etrammel consists of a wooden cross abcd,each arm. of which is slotted or grooved.In these grooves two small hardwood slidingbars are carefully fitted, so that they canbe moved smoothly to and fro. A rod, 1, 2,3, provided with three adjustable trammel heads, is now placed in position as shown inthe… … Fig. 847.—Detail of Joint at B (Fig. 844). of the heads are inserted into the centres ofthe sliding bars at 2 and 3, and by movingthe rod round (the outside head having apencil fitted in it) the ellipse is describedby one continuous line. Eig. 842 shows thetrammel in position, while Eig. 843…
Carpentry · Joinery
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