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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
(Fig. 38,) and bisect it with the perpendicular, c d ; bisect c dwith the line, ef, as at g ; then g is the centre as was required. … 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.…

Carpentry · Architecture

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