Martin, L. C. (Louis Claude), Gamble, William · London, Blackie · leaf 139
ge for controlling intensities) may be used to modify the light received in one part of the photometric field of the instrument from a standard source. This standard consists of a small electric lamp (run under standardized condi- tions), the light from which is transmitted through a filter to… … Fig. 52. — Arons' Colorimeter (diagrammatic) Pi, P., P3, P,, Pairs of polarizing prisms controlling intensities of light. Q, Quartz plate. (A variety of these, having different thicknesses, is provided; they may easily be interchanged.) C, Lummer- Brodhun Comparison Cube. electric) is also provided…
Color photography · Color printing · Color
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