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
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… … Fig. 30. 74.— To erect a perpendicular at the end of a line. Let a,(Fig. 30,) at the end of the line, c a, be the point at which theperpendicular is to be erected. Take any point, as 6, above the 3 18 AMERICAN HOUSE-CARPENTER. line, c a, and with the radius, b a, describe the arc, d a e, through d…
Carpentry · Architecture
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