Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 32
Fig. 29. 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 6 c at e and/; upon the points, e and/,with any radius greater than e c?, 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 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…
Carpentry · Architecture
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