The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 38
to a b ; joinc and b ; bisect c b at d — which will be the centre of the circle. If a circle be not too large for the purpose, its centre may veryreadily be ascertained by the help of a carpenters-square, thus :app y the corner of the square to any point in the circumference,as at a ; by the edges… … Fig. 41. 82.—At a given point in a circle, to draw a tangent thereto,Let c, (Fig. 41,) be the given point, and b the centre of the cir-cle. Join a and b ; through the point, o, and at right angles toa 6, draw c d; then c d is the tangent required.d a
Carpentry · Architecture
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