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Aviation History
1947
1947 - 2195.PDF
DECEMBER 25TH. 1947 7T3 lemonstration son : Radar for Air Survey LL TRAVEL OF FILM • TRAVEL OF AIRCRAFTD iagrammatic representation of how the moving film air camera operates. While the aircraft travels the distance B-A the image in the focal plane travels from b to a. The film is regulated to move ot the exact speed of the image, and as point C is passed the image coir.cides with the permanent slit in the focal plane and the film is exposed. Below is a short section of a strip taken from 3C0ft, A sectioned F52 camera of 1947 with long-f can be seen in the magazine. Both verticals and obliques can be taken in this way but,as will be seen from the accompanying example, the latter can only be pre-set for the centre line of the photograph.The result is a kind of Mercator's projection, with the top half somewhat stretched and the bottom half equallycompressed. Moving-film technique was first applied to air photography for taking aerials at night by the aidof flash bombs, but in that case no slit was employed; the whole area of the film was exposed until the flashbomb had exploded. The demonstration at the exhibition of radar-controlledair survey serves to emphasize the continual improvement which has gone on for many years in aerial mapping. For
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