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A. K. Taylor accumulation of dirt Apparatus for Measurement appreciably greater B.D. angle B.Sc C. J. W. Grievson Calorex cathedral white Maker cleaning completely diffused light concealing power conditions as regards Directed Light double rolled cast Double Rolled Cathedral facing East facing the incident Fatigue Research Board Figured rolled Pattern Glass Sample H.M. Office Hammered double rolled Illumination Research Committee incident light Industrial Fatigue Research Joint Report Light Fig LIGHT THROUGH WINDOW loss of transmission Maximum daylight Measurement of Transmission Medical Research Council NATIONAL PHYSICAL LABORATORY Old Queen Street Optical Pattern G Photometer Pinhead Morocco plate glass wired prismatic glasses Pure white Flemish rate of dirtying Restricted Diffused Light rolled cathedral white rolled Maker Rolled rough cast rough cast Maker rough cast plate Rough rolled plate rough surface Satin finished screen shown in Fig Technical Paper transmission due transmission factor TRANSMISSION OF LIGHT Westminster white Flemish small WINDOW GLASSES