The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 57
he square, viz, 15 and 10 inches ; then the length in inchesacross, will be one-half the number of feet the rafter is long.This method is just as accurate as the preceding ; but whenthe length of a very long rafter is sought, it requires great careand precision to ascertain the fractions. For the… … 104.— To make a circle equal to two given circles. Let Aand #, (Fig. 71,) be the given circles. In the right-angled tri-angle, a 6 c, make a b equal to the diameter of the circle, B, andz b equal to the diameter of the circle, A ; then the hypothenuse.
Carpentry · Architecture
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
