The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 31
a line. Let &,{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 tlieline, c a, and with the radius, h a, describe the arc, d a e.through d and 6, draw the line, d e ; join e and a, then e a willbe the perpendicular… … 74, a,—A second method. Let b, {Fig. 31,) at the end of the line, a b, be the point at which it is required to erect a perpen-dicular. Upon 6, with any radius less than b a, describe the arc,c e d ; upon c, with the same radius, describe the small arc at e,and upon e, another at d ; upon e and d,…
Carpentry · Architecture
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