Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 327
295 SKEW ARCHES. given radius and obliquity when the semi-axes of the elliptical directrices have tan y = r^ — , and r yi sin a ' the ratio to each other — = cos. a; that sin y = , ". a *xi + Vi sin a is, such that if the soffit were cylindrical, its riorht section would be a circle. cos (3 1 If… … Let the angle TlVhFh = <2>, 2 ta?i <* PvED = v, /3 , to 60° ABhB° = a, the distance CPh= xh If or 30°, oblique span = jr' DPT = y. and (3 = the angle between the P F and the tangent plane to the soffit (supposed 'I If a? =45°, oblique span= ~t-t =1.1547 r cylindrical). A Vv B° will then be a right…
Engineering
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