The American house carpenter. A treatise on the art of building. Comprising styles of architecture, strength of materials, and the theory and practice of the construction of floors, framed girders, roof trusses, rolled-iron beams, tubular-iron girders, cast-iron girders, stairs, doors, windows, mouldings, and cornices; together with a compend of mathematics. A manual for the practical use of architects, carpenters, stair-builders, and others (1880)
Hatfield, R. G. (Robert Griffith), 1815-1879, Hatfield, O. P., ed · New York, J. Wiley & sons · leaf 600
14. A third method. Draw any chord, tx.-s ab {Fig. 363), andfrom the point a draw ^^ at right angles to ab \ join c andb; bisect c ^ at d—which will be the centre of the circle. A TANGENT AT A GIVEN POINT 557 If a circle be not too large for the purpose, its centremay very readily be ascertained by… … Fig. 363. circle, as at b and c; join b and c; then if be is bisected, as atd, the point <^ will be the centre. (See Art. 352.) 51L—At a Oil en Point in a Circle to Draw a Tangentthereto.—Let a {Fig. 364) be the given point, and b the cen-
Carpentry · Architecture · Building
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