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 34
g* 28,) PRACTICAL GEOMETRY. ir set oflf any distance, as a 6, 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, describeanother at d; join d and a, and the Une, d a, will be the per-pendicular… … Fig. 29. 73.— To let fall a perpendicular. Let a, [Fig. 29,) be thepoint, 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 6 c at e and/; upon the points, e and/,with any radius greater than e d, describe…
Carpentry · Architecture
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