The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing (1866)
Armengaud, Charles A., 1813-1893, Armengaud, Charles, 1813-1893, [from old catalog] joint author, Amouroux, Jules, [from old catalog] joint author, Johnson, William, 1823-1864. [from old catalog] · Philadelphia, H. C. Baird · leaf 25
thatone—whether crescendo or diminuendo—the greater will be thedifference of the result from the true one. From this it follows,that if a rule applies not to all, it can only apply to one propor-tion ; and also, that if it apply to a certain proportion and not toanother, it can only be correct in… … Set off B I, A J, and c k, equal to h c; join J k, and bisect it in r,and at r erect a perpendicular, cutting c d, or c d produced, at m ;then make g e equal to g M; J, e, i, m, wiU be the centres of thefour circles required. Through the points, j and i, draw m n, M oE p, E Q, each equal to m c ;…
Mechanical drawing
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