The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 40
82.—At a given jjoiiil in a circle, to draw a tangent thereto.Let a, {Fig, 41,) be the given point, and b the centre of the cir-cle. Join a and b ; through the point, a, and at right angles toa bj draw c d ; c dis the tangent required. … Fig. 42. S3.— The same, without making use of the centre of thecircle. Let a, {Fig. 42,) be the given point. From a, set oiFany distance to 6, and the same from b to c; join a and c ;upon a, with a b for radius, describe the arc, d b e ; make d bequal to be; through a and d, draw a line ; this will…
Carpentry · Architecture
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