A treatise on the construction of staircases and handrails ... Preceded by some necessary problems in practical geometry; with the sections and coverings of prismatic solids (1820)
Nicholson, Peter, 1765-1844 · London, J. Taylor · leaf 49
ce of the ordinates formed by any two radii may be equal to thedifference between any other two ordinates at the same angle, the spiral is called thespiral of Archimedes. This form of spiral may be imitated with a compass, as in fig. 5, and may be drawnfrom centres which form the angles of a… … I SPIRALS. 23 This is exceedingly useful in the construction of a stair with a conical well-hole, andmay be described from any given radius as the greatest; the ends of the longest stepsapproach nearest to the centre of the spiral, and the ends of the shortest are the mostremote. Thus, let the…
Stair building · Hand-railing
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