The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 350
d durable timber, called iron-barkwood, particularly well suited for sleepersand rails, by merely arming theedge with angle iron. 1SJ7] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 313 MEASUREMENT OF ANGLES.A New Method of Measuring the Degrees, Minutes, Sfc, in any Recti-linear Angle, hy Compasses… … take A B in the compasses, and apply it from B to 1; from 1 to 2; from 2 to 3 ; &c. (the numbers outside the circle are referred to). If, in applying the arc A B, we find that on our return to B, after n applications, we have a coincidence, then it is well known that the number of degrees,…
Architecture · Civil engineering · Science
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