The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 148
Fig. 148. ters of the required ellipse. To describe the curve by intersec-tion of lines, proceed as directed at Art. 118 and note; by atrammel, see Art. 116 ; and to find the foci, in order to describe itwith a string, see Art. 115.
Carpentry · Architecture
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