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 39
81, a.—A second method. Upon any two points in the cir-cumference nearly opposite, as a and 6. (Fig. 39,) describe arcscutting each other at c and d: take any other two joints, as eand/, and describe arcs intersecting as at g and h ; join g and h,and c and d ; the intersection, o, is the centre.… … •81> &• — - method. Draw any chord, as a 6, 40,) PRACTICAL GEOMETRY. 23 and from the point, a, draw a c, at right angles 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…
Carpentry · Architecture
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