[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 19
tre curve. To find the length of curve and point of contact : Fromthe point C as a centre, with B S, Fig. 2, as a radius, describean arc cutting the curve in. the point D. To find the direction of the straight rail : From the pointsC and D as centres, with A R, Fig. i, and D B, Fig. 2, asradii,… … SRAIR BUILDING. 15 PLATE VI Exhibits the plan of a round rail for a platfor7n stairs^ on afour-inch cylinder. To draw the elevation of the tangents : Square up fromA to C equal the riser ; from the points B and C draw thecommon pitch to S and R. To find the vertical and horizontal sides of the…
Stair building
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