Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 227
ight is the same as that of the first, which is here and is gene-rally the case, the face-mould for the lower twist will, when re-versed, do for the upper flight: that part of the rail, therefore,which passes from e to c and from c to Z, is all that will need ex-planation. Suppose, then, that the… … Fig, 263. be revolved on e c as an axis, in the manner indicated by the ares,0 n and a x, until it coincides with the plane, e r t c ;. the line, a0, will then be represented by the line, x n ; then add the paral-^lelogram, xrt n^ and the triangle, ctl, deducting the triangle, er s ;and the edges…
Carpentry · Architecture
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