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 (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 254
Fig. 286. … Fip. ^7. and x ; then, n and x being of the same height, n x is a level line ;and this line lying perpendicularly over r s, n x and r s must beof the same length. So, all lines on the top, drawn parallel to na;, and perpendicularly over corresponding lines drawn parallel tor s on the base, must be…
Carpentry · Architecture
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