The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 54
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 tioo given circles. Let .4and i?, [Fig. 71,) be the given circles. In the right-angled tri-angle, ah c, make a b 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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