## A dissertation on the construction and properties of arches |

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according adjusted to equilibrium angle N E A angles contained arch of equilibration catenary centre cohesion columns considered construction of arches cosine counterpoise curve denoted draw the line edifice entire arch equi equipoise fastenings figure fixed abutment force of pressure form an arch given weights highest or middle highest wedge impels the wedge inclination including the weights initial pressure intersects lateral force line G A line R X middle section middle wedge number of sections oblique parallel pendicular principles proportion radius represents the pressure Section next following sections are equal sections or wedges Semi semiangle semiarch Shewing the angles sides similar triangles sine specific gravity suppose Table tang terminated tion twice the tangent vertical line V O wedges or sections wedges which form weights and pressures weights superincumbent x tang