Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 312
290 VAN NOSTRAND'S ENGINEERING MAGAZINE. is necessary to equilibrium that the di- the beam and the vertical wall. This is rections of E and E-i make angles with among the untrue hypotheses that are often so confidently stated by learned Fig. 1. mathematicians. f' SYMMETRICAL ARCHES. / V , Fig. 2.… … 2. * "We shall consider first an arch, It is evident that for incompressible formed of two branches AC, BC, (Fig. 2), voussoirs, the force R2 passes through b symmetrical and placed in juxtaposition, and Rj through a, as this gives the least and comprised between two parallel ver- horizontal thrust…
Engineering
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