Theory of Arches

abscissas arc A D B₁ Brevet C A B CAB Fig circle cloth common catenary conjugate diameters constant cord cosec crown curvature cylinder depth determine direction directrix distance distributed edition ellipse Fig Engineer engravings equal equation extrados force H geostatic arch H₁ half-arch Hence hori horizontal component horizontal force horizontal lines horizontal load horizontal thrust hydrostatic arch Hypsometry i₁ Illustrated inclined intensity length line of pressures linear arch little triangles load on A D middle third normal force normal load NOSTRAND'S PUBLICATIONS ordinate parabola parallel projections parallelogram of forces plane plates point of rupture Practical quadrant radius radius of curvature ratio revised and enlarged soffit span Steam tangents Telegraphy tical tion transformed catenary Treatise U. S. Navy uniform V₁ cot vertical force vertical lines vertical load voussoirs weight zontal