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  1. J. Strong, Procedures in Experimental Physics (Prentice-Hall, Inc., 1938), p. 69.
  2. R. Platzeck and E. Gaviola, J. Opt. Soc. Am. 29, 484 (1939); A. G. Ingalls, Amateur Telescope Making, Book Three, article by I. H. Schroader, “The caustic test” (Scientific American, 1953), p. 429.

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Fig. 1
Fig. 1

Knife-edge test of rotating mirror.

Tables (1)

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Table I Focal lengths of typical mirrors at operating speeds.