A practical manual of house-painting, graining, marbling and sign-writing : containing full information on the processes of house-painting in oil and distemper, the formation of letters and practice of sign-writing, the principles of decorative art, a course of elementary drawing for house-painters, writers, etc., and a collection of useful receipts ; with nine coloured illustrations of woods and marbles, and numerous wood engravings (1888)
Davidson, Ellis A., d. 1878 · London : C. Lockwood & Son · leaf 325
ided intounits ; and thus angles may be constructed or measuredwith the greatest accuracy. Fig. 106. Within the given square a b c d, toINSCRIBE THE LARGEST EQUILATERAL TRIANGLE it will CONTAIN. Trisect the right angle dab. Bisect the angles e a f and g a h by the lines a i and A J. Join I J. Then… … A H B Fig. 106. Equilateral Triangle is 60°, there is an overplus of 30°.If then the two outer angles (e a f and g a h) whichare each 30° are bisected, and half of each (15°) added tothe angle fag (30°), an angle of 60° is obtained centrallyplaced, leaving 15° on each side. It will be seen thatthe…
House painting · Sign painting · Lettering
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
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