Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 762
mouth pine; and spruce, white fir or deal. Formula for Proportioning Arches for Bridges. 303 Now the strain at the centre of a bridge (whether the bridge con-sist essentially of an arch of wood, iron, or stone; or whether its de-pendence for resisting crushing strains is placed in straight… … Each half of the span constitutes a lever, Figs. 2 and 3. It tendsto fall by revolving on its fulcrum s,with a force represented by itsweight multiplied by the horizontal distance n s of the centre of gravityG of that weight, from the fulcrum s, which distance is the leveragethrough which said…
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