The American house-carpenter : a treatise upon architecture, cornices and mouldings, framing, doors, windows, and stairs : together with the most important principles of practical geometry (1849)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 260
237 STAIRS. … c r Fig. 286. 237. and a;; then, n and x being of the same height, n x\s a level hne ; and this line lying perpendicularly over r 5, n x and r s must be of the same length. So, all lines on the top, drawn parallel to n X, and perpendicularly over corresponding lines drawn parallel to r s on the…
Carpentry · Architecture · Building
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Clariss[imi] pictoris et geometræ Alberti Dureri, De varietate figurarum et flexuris partium ac gestib[um] imaginum, : libri duo, cqui priorib[us] De symmetria quondam editis, nunc primum in latinum conversi accesserunt (1534)](https://img.insideoutlibrary.com/img/200/ia-clarissimipictor00dure-109-110.webp)
