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A LIGHT INTENSITY METER J. L. McCOY*
Ever since the beginning of photography, the judging of light value has been one of the great problems, to the photographer or camera man. In many cases in the past as now, the person responsible for taking of pictures is required to judge light values using his naked eye as an indicating means. His accuracy or ability to do this is the product of his appreciation and his experience as received through this natural indicator. The unassisted eye at its best is considered unstable with a possible error of 100 percent or more from day to day when used as a light intensity measuring instrument. It is unreasonable to expect that two or more men would come very close in a simultaneous check. In order to assist the eye in measuring light and to obtain consistent results, several types of photometers have been developed. In most cases, these instruments are rather awkward to use because they require a comparatively slow process of matching of light intensities, to obtain a reading. Therefore, they might be classed as laboratory equipment, from a studio standpoint, rather than practical and portable direct reading indicators.
As a natural result, there has been a need for a studio type of photometer that could be worked, set up, and read quickly without making adjustments. For this reason, the Westinghouse Lamp Company and the Westinghouse Elec. and Mfg. Company have designed this new tool, to place in the hands of the photographer or camera man to assist him in his work.
This new indicating electrical eye should have the same value to the camera man as the slide rule to the engineer. It is a quick reading light yardstick as simple as a voltmeter to read. As this is a very new development, we are not sure just what the possibilities or limitations of this device might be, but it is felt that it has a wide application in the motion picture and other photographic industries.
This meter is self-contained and carried as a complete unit in one case. The light sensitive pickup is a photo-electric cell covered
* Westinghouse Lamp Co., Bloomfield, N. J.
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