Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 175
A The form of the brick being that of a voussoir of an arch, exceptthat the top and bottom are both made flat, suppose the dimensionsof the upper surface to be ten inches by fiveinches, and the depth six inches, the radiusof the arch twenty feet; agreeably to whichsupposition the subjoined drawings…
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