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REPORT OF SUBCOMMITTEE G ON EXPOSURE METERS*
i J. M. WHITTENTON**
A proposed American War Standard Specification for Exposure Meters has been drawn up as a part of the standardization activities of the War Committee on Photography and CinematographyZ52. The Z52 American War Standards Subcommittee G, under the Chairmanship of Mr. F. K. McCune, undertook this work at the request of Capt. Lloyd T. Goldsmith, Signal Corps, who is Chairman of the Armed Forces Committee on Photography and Cinematography.
The Armed Forces in the past have purchased exposure meters which, for the most part, have been of the commercial type, designed essentially for peace-time applications. Reports from the field have indicated that not all of these meters have successfully fulfilled the rigid requirements of the armed services in battle areas in all parts of the world. This fact made it imperative to consider the service requirements for exposure meters and to draw up a specification that would cover a standard type of meter which would be entirely acceptable, from the standpoint of construction and performance, to all branches of the service.
Such a specification has been drawn up by members of industry in cooperation with representatives of the armed services, and it is hoped that this specification will be approved as a joint Army-Navy specification and used first as a development specification, and ultimately as a basis for procurement of production units.
The work of this Subcommittee began by deciding upon a method of light measurement and maximum sensitivity. It was decided that the new exposure meter should be of the general-purpose type designed to operate on the principle of reflected light, in order to be adapted to all types of military use. The maximum sensitivity de
* Presented Apr. 19, 1944, at the Technical Conference in New York. ** Alternate Chairman, Subcommittee G, ASA War Committee on Photography and Cinematography -Z52.
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