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 58
on e, with e a for radius, describe the semi-circle, a d PRACTICAL GEOMETRY. 41 c ; at b, erect b d, at right angles to a c ; then b d will be themean proportional between A and B. For an application of this problem, see Art. 105. CONIC SECTIONS. 111.—If a cone, standing upon a base that is at… … cone be cut by a plane in the direction, ef, the section will bean ellipsis ; if in the direction, m Z, the section will be a para-bola ; and if in the direction, r o, an hyperbola. (See Art. 56to 60.) If the cutting planes be at right angles with the plane,a b c, then— 112.—To find the axes of the…
Carpentry · Architecture
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