London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 450
166 … greater angle, and the object and the rays will form an isoscelestriangle (as iwjg. 164..). Let the eye retain its position at a, andlet the ray a c also remain in its present position; then placethe object b c perpendicularly to the ray a c ; the point a, in theray to b, will rest on the arc b c,…
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