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 (1849)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 40
CTICAL GEOMETRY. 17 set off any distance, as a b, and the same distance from a to c ; upon c, as a centre, with any distance for radius greater than c a, describe an arc at d ; upon 6, with the same radius, describe another at d ; join d and a, and the hne, d a, will be the per- pendicular… … rr Fig. 29. 73. — To let fall a perpendicular. Let a, {Fig. 29,) be the point, above the line, h c, from which the perpendicular is re- quired to fall. Upon a, with any radius greater than a d, de- scribe an arc, cutting b c at e and /; upon the points, e and/, with any radius greater than e d,…
Carpentry · Architecture · Building
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