. Fig. 2. -a mosaic of ALEXANDRIA, CONSISTING OF 174 PHOTOS. mosaic, and tlie whole was then rcphotographed and distributed to the various commanders. After the war this method was employed experimentally for town-planning purposes and for exploration work, where it has been proved of the greatest possible use. The British camera most generally used is con- structed by Messrs. Williamson Brothers, the size of the plate being 5 X 4 in. The cameras are of a fixed focus type with long focus lenses. Panchromatic plates are invariably used in order that correct colour rendering may be secured. Shut
. Fig. 2. -a mosaic of ALEXANDRIA, CONSISTING OF 174 PHOTOS. mosaic, and tlie whole was then rcphotographed and distributed to the various commanders. After the war this method was employed experimentally for town-planning purposes and for exploration work, where it has been proved of the greatest possible use. The British camera most generally used is con- structed by Messrs. Williamson Brothers, the size of the plate being 5 X 4 in. The cameras are of a fixed focus type with long focus lenses. Panchromatic plates are invariably used in order that correct colour rendering may be secured. Shutters are of the focal plane type working directly in front of the plate. Several efforts have been made to produce a type of camera which will automaticallv expose a plate and change it at definite intervals, so that the pilot will have little to do except fly the machine, whilst other attempts have been made to produce town plans by means of kinematography. Apart from military requirements, the civil uses of the aerial camera will be in town-planning and in
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