London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 80
e radius of its circle. Thus far with regard to the circular curve ; and, since archesare constructed of other forms, derived from curves called the Pjviciples of ConstructzoJi i?i Arches, 59 conic sections, &c., such as the ellipse, the parabolic and thehyperbolic, the cycloid and the… … zontal and perpendicular forces in the circular curve will almostcorrectly apply to the elliptic form. In the diagram Jig. 12.ab cis B. semicircular arch, and d bj is an ellipse, which is de-noted by the dotted line; g g are the foci: /?, the centre of thelarge circle segment i k ; and /1 are the…
Architecture
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