Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 171
een R and W also =■ a. normal to BD. Therefore Draw the Triangle of Forces, having H = W tan. a .... (I) its sides respectively parallel to these three directions, and make the side W of But W, which represents the weight of a prism of earth ABD, one foot in such a length as to represent the weight… … In order to investigate this, in Fig. 2 and putting the value thus obtained = 0 let fall perpendiculars AK, DL, on natu- for a maximum, there results the follow- ral slope BC. ing equation Suppose Constant Quantities {q—x cot. /3) (£>—2x) — {p>x—x2) (-cot. fi)— 0 |J=AK, length of perpendicular from…
Engineering
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