A shorter course in woodworking; a practical manual for home and school (1911)
Wheeler, Charles G. (Charles Gardner), 1855-1946 · New York, London, G.P. Putnam's sons · leaf 39
Fig- 36 a beam-compass (sometimes called aFig. 35 trammel) is used. This is a rod having sliding sockets which carry steel or pen-cil points (Fig. 40). As a substitute, two nails (or a nail and a pencil) putthrough a stick can be used (Fig. 41). This is more accurate than to use astring. (See also…
Woodwork
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