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The requirements of the government agencies interested in crop control, soil conservation, large scale irrigation projects, and the installation of hydro-electric plants have greatly accelerated the photographing of large areas of the United States from the air. It is desirable that these photographs be of such quality and character that they may be satisfactory, not only for present needs, but also for other purposes that may develop, and thus save the expense of reflying territory that has once been photographed. To insure the production of such photographs it is necessary that the airplane camera be of suitable accuracy and correctly calibrated. The American Society of Photogrammetry has recognized this need and has appointed a Committee on Precision Cameras to formulate camera specifications. An article by Irvine C. Gardner, entitled "Specifications for a Precision Mapping Camera," which is published in "Photogrammetric Engineering," presents the results of an investigation made in connection with the work of this committee.
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