SURVEYING WITH A CAMERA. (INCLUDING PLATE).

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SECT.11.-OTHER SELECTED PAPERS. (Paper No. 3894.) Surveying with a Camera." By STEPHEN MITCHEL DIXON, B.A.I., M. Inst. C.E. M.A., THE great use of photography in surveying, particularly in mountainous and treeless regions, has long been recognized ; and photosurveying has been practised in the Canadian Survey system and elsewhere for many years. Generally the photo-theodolite in one of its many forms has been used ; but this instrument with its accompanyingplate-carriers is cumbersome and heavy-weighing about 38 1bs...

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