London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 280
scfa very hard nature. It has been shown, that, by developing all the various surfaces,instead of having to think of complicated spiral lines, they areat once reduced to straight ones ; and I will now very brieflyshow how simply the data necessary for the construction of askew arch may be obtained… … are the transverse sections; let these cylinders be cut by thestraight line g /z, at the angle of askew, that is, the angleformed by the two roads crossing each other; and from thepoints z, 7, k draw three straight lines at right angles to theaxis, and of such lengths that i I shall be of equal…
Architecture
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