An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth (1888)
Gwilt, Joseph, 1784-1863, Papworth, Wyatt Angelicus Van Sandau, 1822-1894 · London Longmans, Green · leaf 336
of A P,cutting the lines MiM, WM, &.c. at MIM,&c. ;then through all the points jM, M, jM, &c.draw a curve, which will be a parabola. 1100. Theohem V. // a tangent be drawnfrom the vertex of an ordinate to meet the axisjiroduced, the subtangent PT (_^^. 448.) will lie equal to twice the… … KM : KI::GK::P;KM : KI::PT : PM.P : PM::GK : PT;P : PM::PM : A P.AP : PT::PM : GK. Then, by Theor. II., And as MKI, TPIM are similar. Therefore, by equality. And by Cor. Theor. 1., Therefore, by equality, But when the ordinates HI and PM coincide, MT will become a tangent, and GK villbecome ecjual…
Architecture · Architects
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