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 62
m /,(Fig- 79,) parallel to a c, be the direction of the cutting planeFrom m, draw m d, at right angles to a b ; then I m will be theaxis and height, and m d an ordinate and half the base; as atFig. 92, 93. 114.— To find the height, base and transverse axis of anhyperbola. Let o r, (Fig. 79,) be the… … Fig. 80. 115.— The axes being given, to find the foci, and to describean ellipsis ivith a string. Let a b, (Fig. 80,) and c d, be thegiven axes. Upon c, with a e or b e for radius, describe the arc,ff; then/and/, the points at which the arc cuts the transverseaxis, will be the foci. At/ and/place…
Carpentry · Architecture
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