Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 22
e triangles formed,) and is thereforea generatrix of the warped surface which lies between thotwo pairs of planes. But this diagonal of course bisects itsparallelogram; the same is true of any other generatrix;consequently the surface which they form is every wheremidway between the surfaces of the… … 16 Civil Engineering. Some examples will show the practical bearings of the principleswhich have now been established. Example 1. We will begin with the solid represented in fig. 1. Itis an excavation a hundred feet in length, all the dimensions beinggiven in feet. Its nearer end has the outside…
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