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 66
tangent given, to detect the pointof contact, hetagbf, {Fig. 89,) be the given ellipsis and tan-gent. Through the centre, e, draw a h, parallel to the tangent jany where between e and/, draw c d, parallel to ab ; bisectcdin0 ; through o and e, dmwfg; then g will be the point of con-tact required.… … 125.—An]/ diameter and its conjugate being given, to as-certain the two axes, a7id thence to describe the ellipsis. Leta 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 or h b…
Carpentry · Architecture
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