Abstract:The camera used in Canadian surveys is a typical, strong, simple, and effective one of its kind; its construction can be seen from Fig. 2, which is taken from the paper just mentioned. It weighs 20 Ibs. complete in case with twelve loaded plate-holders. The lens is a Zeiss Tessar, Series 111, the focal length of which is 164 mm. The horizontal and vertical fields are 51' and 37" respectively.
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