Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 23
Fro. 7. -Showing new work in trench. tion I have indicated. No serious efforthas been made so far. A great dtal of experimenting remainsto be done with filters in conjunctionwith panchromatic and other platessensitive to single colours, and also theuse of goggle filters for the detection… … («) (6) Fig. 8, -Showing value of a red screen, used in conjunction with panchromatic plate,in cutting out fog. two of which would generally register inthe stereoscopic viewer. H six weretaken when the observer was flyingstraight, it would be found that Nos. 1and 6 combined would often give…
Lighting
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