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

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A0 x sec A0 x tang abutments Log abutments to radius according arch of equilibration ascertain assumed breadth centre arch chord circle Computation consequence cosec course of voussoirs cubic foot cubic inch determined difference dimensions distances draw drawn entire pressure equilibrium erected experiment fluxion form an arch former Tract geometrical highest sections horizontal force inch of brass initial pressure parallel inserted key-stone Lesser Sides London Bridge lowest surface magnitude ment Model ounces avoirdupois perpendicular plane preceding pages principles properties of arches proportion proposition quantities radius OV RIVER THAMES rule rule in page section A0 sections are inferred semiarch similar and equal sine slant height solid contents specific gravity subtend successive sections summit Telford and Douglass tion triangle trigonometry vertical line w x cotang wedges weights thereof Xcos.V