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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

An illustration from 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, leaf 39
81, a.—A second method. Upon any two points in the cir-cumference nearly opposite, as a and h. {F\s:. 39,) describe arcscutting each other at c and d: take any other two points, as eand/, and describe arcs intersecting as at g and h ; join g and A,and c and d; the intersection, o, is the centre.… … 81, b.—A third method. Draw any chord, as a b, (Pig, 40,) PRACTICAL GEOMETRY. 23 and from the point, a, draw a c, at right angles to a b ; join c and b ; bisect c 6 at a—which will be the centre of the circle. If a circle be not too large for the purpose, its centre may veryreadily be ascertained…

Carpentry · Architecture

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