Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 33
f 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 b, above the 3 18 AMERICAN HOUSE-CARPENTER. line, 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 «, then e a… … Fig. 31. 74, a.—A second method. Let 6, {Fig. 31,) at the end of theline, a b, be the point at which it is required to erect a perpen-dicular. Upon b, 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…
Carpentry · Architecture
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