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 61
I d, at right angles toac; then I d will be themean proportional between A and B. That is, a 5 is to I duId is to be. Tliis is usually stated thus—a I :l br.bdand since the product of the means equals the product of theextremes, therefore, abxbc=Td\ This is shown geometri-cally at Art. 105. CONIC… … (e& a I c, Fig. 79;) and the base will be a semi-circle. If a conebe cut by a plane in the direction, e f, the section will be anellipsis / if in the direction, m I, the section will be & parabola ;and if in the direction, r o, an hyperbola. (See Art. 56 to 60.) Ifthe cutting planes be at…
Carpentry · Architecture
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