The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 369
description of an instrument whichI have found extremely useful for setting out railway curves is well adaptedfor all situations, and is very portable and simple. A r. C OP- I) is a permanent frame or square B C being perpendicularto A B, and li C is a moveable limb with a vernier to read ofif the… … Fig. 1. Fig. S. In order to use this instrument, it is necessary to calculate by trigono-metry the angle a b c fig. 2, and the length of the secant, for the purposeof finding the length of the effect a b, the latter is equal to the dillerence ofthe radius of the cune and the secant; in all cases it…
Architecture · Civil engineering · Science
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