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 250
Fig. 595 secting the semi-circumference at C and D. Draw OC and OD. AnglesAOC, COD, and BOD will be 60°. Bisect AOC (Prob. 7) and AOF willbe 30°. FOD will be 90°. COB will be 120°. FOB will be 150°. Eitherof the other angles can be bisected in the same way. … Fig. 597 Fig. 598 To draw these angles with a triangle, use the corresponding angles ofthe triangle (Figs. 560 and 561). The angles of an equilateral triangle (Fig. 597) are 60°, and 120° ismade by projecting either of the sides, so these angles can be accuratelyfound by drawing an equilateral…
Woodwork
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