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The possibilities of apn oscilloscopic examination of the operation of function generators with two or more input variables are discussed. The principles of axonometric oscillography are reviewed and supplemented by a circuit for revolving and inclining the oscilloscopic displays. These results are illustrated by means of examples of generators of the most common functions with two independent variables. Finally an attempt is made to represent some simple functions of three independent variables by means of axonometric four-dimensional oscillograms.