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A new manual of perspective: containing remarks on the theory of the art, and its practical application in the procudtion of drawings ... Illustrated by numerous engravings (1849) Whittock, Nathaniel · London, A. Hall & Co. · leaf 23
how the division ofthe circle. All angles are measured by thedegrees in the circle. We have shown, inExample 10, that any two lines approachingeach other till they meet, form an angle. Thuswithin the semicircle before us, the lines drawnfrom f and c meet at the centre g. This iscalled the angular… … G © MANUAL OF PERSPECTIVE. 21 three of the spaces of ten degrees on the semi-circle. This angle is a triangle of thirty-degrees. The lines drawn from a b to thecentre g, include six of these spaces. This isan angle of sixty degrees. To prove that thesize of the angle has nothing to do with… Perspective
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