[Gould, Lucius D.], b. 1814. [from old catalog] · New York, W.T. Comstock · leaf 17
e direction of straightrail : From the point C as a centre, with B P, Fig. 2, as aradius, describe an arc cutting the curve in D, the pointrequired ; from the points D and C as centres, with S R,Fig. I, and B C, Fig. 2, as radii, describe arcs cuttingeach other in J ; draw C J and J D the direction… … STAIR BUILDING. I3 PLATE V Exhibits the plan of a round rail Ofi a four-inch cylinder^ atthe starting of the second flight. To find the length of curve required for the easing orwreath : Square up from A to B equal one riser ; from thepoint B, draw the common pitch ; set up from A to C equalhalf…
Stair building
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