The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 467
ment A draw Xw, Xwparallel to dr, dr, and produce Dr, Dr, to /, / and w, w, then by similartriingles. dU : rD: : cD : tD,novi2rD = rDr, and 2/Z) = /J[)/, and by transpos-ing, &c., the above proportion (7iJ : cD : : 2rD : 2//) : : rDr : /fl/, butit has been before shown that dn : cD ■ . rDr, or… … Again, by the construction (similar triangles. Fig. 2) it is evident alsothat <//) : XD : : rDr : uJHc, or is dl) :~Xd+dD . . rDr : rZ)r+2icr, and by subtraction dfl : Xd : : rDr : 2!tr, or -y^^-z—. now di) and riSr rDr 2wr are variable quantities and vary as each other, but Xd is for the same…
Architecture · Civil engineering · Science
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