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 152
ntly used under man-tle-shelves. The tangent, i h^ is found thus: bisect the line, a h,at (?, and h c at d; from d, draw d e, at right angles to 6 5 / from5, draw hf, parallel toed; upon 5, with h dfor radius, describethe arc, df; divide this arc into 7 equal parts, and set one of theparts from 5,… … Fig. 179.
Carpentry · Architecture
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