The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 32
. 28,) PRACTICAL GEOMETRY. 17 set oft 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 line, d a, will be the per-pendicular… … 73._ To let fall a perpendicular. Let a, (Fig. 29.) be thepoint, above the line, b 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, describe arcs, cutting…
Carpentry · Architecture
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