In the gnomonic projection the shift from one plane of projection to another can be accomplished graphically by several different methods; by their use the observer is able to locate the positions of diametral planes and of single points in the new projection. Several new methods, based on the isometric lines and their polar planes, are described briefly, together with the existing methods. The usefulness of the gnomonic projection as an aid in photogrammetric mapping from airplane photographs is emphasized.

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