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 (1849)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 60
viz, 15 and 10 inches ; then the length in inches across, will be one-half the number of feet the rafter is long. This method is just as accurate as the preceding ; but wheii the length of a very long rafter is sought, it requires great care and precision to ascertain the fractions. For the least… … 104. — To make a circle equal to two given circles. Let A andi?, {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, and c h equal to the diameter of the circle, A ; then the hypothenuse, Fig. 72.
Carpentry · Architecture · Building
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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