Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 250
bility when the force p makes a greater angle with that jointthan 30 degrees, or thereabouts. On Bridge Construction. 243 We now arrive at the determination of the constant value of 7i, inEquation (2), page 147. Let abed, . . g, be the intrado of any arch, and A B c D, . . H,be the extrado. Now… … It follows that the weight at the point d, which acts through thetwo braces, (so to express it), d e . . d e, shall have such a horizontalvalue that the points c and e shall be maintained in equilibrium by theequivalent horizontal thrust due to the value of the vertical weight atthe point c and e.…
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