The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 327
pectively touch the curve, they are tan-gents to it. By the properties of the Conic Sections (see Dr.Hymers elegant treatise), we have, AOX MO = a O-; butMO =: ra O, therefore a O- = A O X m O. Also, by the propertyof the Circle, we have a O^ ^ O R-. A similar mode of proof applies to the conjugate… … Rule.—Multiply the diameter of the circle by l-22t for thetransverse diameter, and by -707 for the conjugate diameter. E.r.—Given the diameter of a circular turn-table = 14 5,to find the transverse and conjugate diameters of its isometricalrepresentation. Here, by the rule, 14-5 x 1224 = 17-748…
Architecture · Civil engineering · Science
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