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 37
Fig. 34. 77.— To bisect an angle. Let a b c, {Fig. 34,) be the angle to be bisected. Upon b, with any radius, describe the arc, a c ; upon a and c, with a radius greater than half a c, describe arcs cutting each other at d ; join b and d; and b d will bisect the angle, a 6 c, as was required. This… … Fig. 35. 78.— To trisect a right angle. Upon a, {Fig. 35,) with any tadius, describe the arc, b c ; upon b and c, with the same radius, describe arcs cutting the arc, 6 c, at c? and e ; from d and e, draw lines to a, and they will trisect the angle as was required. The truth of this is made evident…
Carpentry · Architecture
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