Figs. 4 and 4a. Experiment to prove that the reflections on a glazed picture are in a different focal plane from the picture itself.—Thus creating a constant eye strain. Fig. 4 Shows the effect when the camera is focussed in the plan of Gloucester—the upper reflected plan is merely a blur. Fig. 4a Shows the effect when the camera is focussed on the upper planthe plan of Gloucester is now a blur.

Progress, Volume XIII, Issue 4, 1 December 1917, Page 87

Figs. 4 and 4a. Experiment to prove that the reflections on a glazed picture are in a different focal plane from the picture itself.—Thus creating a constant eye strain. Fig. 4 Shows the effect when the camera is focussed in the plan of Gloucester—the upper reflected plan is merely a blur. Fig. 4a Shows the effect when the camera is focussed on the upper planthe plan of Gloucester is now a blur.