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 109
*. … THE PROPORTIONAL SPIRAL AND SCROLL. 39 The expansion of the scroll, in order to make it more open or close, will dependupon the proportion of the two first radii; for, if they are equal, the spiral will become acircle; and if the difference is great, the opening between will also be great. In this…
Stair building · Hand-railing
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
