Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 52
the 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 jB, [Fig. 71,) be the given circles. In the right-angled tri-angle, ah c, make a h equal to the diameter of the circle, B, andc b equal to the diameter of the circle, A ; then the hypothenuse,
Carpentry · Architecture
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