The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 67
h a tangent given, to detect the pointof contact. Ijetagbf, {Fig. 89,) be the given ellipsis and tan-gent. Through the centre, e, draw a b, parallel to the tangent;any where between e and/, drawc d,parallel to ab ; bisectcdin0 ; through o and e, draw/ ^ ; then g will be the point of con-tact… … 125.—Any diameter and its conjugate being given, to as-certain the two axes, and thence to describe the ellipsis, ijeta b and c d, {Fig. 90,) be the given diameters, conjugate to oneanother. Through c, draw e /, parallel to a b ; from c, draw cg, at right angles to ef; make c g equal to a h ot h b…
Carpentry · Architecture
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