Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 214
e made d that the breadth must vary directly as constant by assuming the depth to be Fig. 48. the length. Hence the plan should be a This corresponds to a parabola, and triangle with vertex at C (Fig. 48.) the beam, if the top be straight will On the other hand, if we suppose the have the elevation… … Fig. 49. To render S constant we must have, L „ A b* y>x .*. b'=cx and d*=nicx. ElMfatiofV ^v These are the equations of a cubic para- bola. Hence the horizontal section (Fig. v Fig. 51. cross section is rectangular as in (Fig. 52). In Case II. we have Fig. 50. 3W*' 50), and the vertical section…
Engineering
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