Marion and Co., compiler · London : Marion and Co. · leaf 96
88^ PRAC;riCAL GUIDE TO PHOTOGRAPHY. l{ will be seen at once that if the ground glass were to have the position A B perpendicular to the axis E F of … the lens, the rays of light coming from the head would focus in front of it, those coming from the feet would focus behind it. If, however, we swing the ground glass so as to occupy the position C D, then both the rays from the head and the feet will come to a focus approximately upon it. This is…
