Builder's architectural drawing self-taught : containing descriptions of drawing instruments and accessories, with rules for using them, and hints as to their care and management ... (1903)
Hodgson, Fred. T. (Frederick Thomas), 1836-1919 · Chicago : F.J. Drake & Co. · leaf 169
ptical arch shown at Fig. 129, we must pro-ceed as follows: Let ZZ be the foci, and B apoint on the intrados where a joint is required;from ZZ draw lines to B, bisect the angle at Bby a line drawn through the intersecting arcsD produced for the joint to F. Joints at i and2 are found in the same… … voussoirs near the springing line of the arch arethus increased in size for greater strength.The diagram shown at Fig. 130 shows a lancet ar-i
Architectural drawing
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