Abstract
An expression is obtained for the amount of flux received from a perfectly diffusing circular luminous disc (i.e., one radiating according to the cosine law) by a second parallel and coaxial disc. This is obtained from Sumpner's theory of the whitened globe, and also from first principles. The following applications of the theory are made: (I.) It is shown that the surface traced out by the edges of coaxial discs which receive equal amounts of flux from a radiating disc is an hyperboloid of revolution about the common axis of the discs. (II.) The amount of flux received from a radiating disc by the walls of a cylinder infinitely long in one direction is found.
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