## A Dissertation on the Construction and Properties of Arches |

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according adjusted to equilibrium angles contained arch of equilibration Bºx tang catenary columns construction of arches cosine counterpoise curve denoted direction draw the line edifice entire arch equi equipoise fastenings figure fixed abutment force of pressure force PQ force Z form an arch given weights highest or middle highest wedge impels the wedge inclination including the weights initial pressure lateral force line GA middle section middle wedge number of sections p x cos p x sin parallel pendicular perpendicular PH x A F principles proportion radius rules secant section is equal Section next following sections or wedges semiangle semiarch Shewing the angles sides similar triangles sine specific gravity suppose Table terminated tion vertical line wedges or sections wedges which form weights and pressures weights superincumbent