Abstract
By Johannes Hoch, Bonn Summary of the Translation from the German by B. A. J. Clark† Victorian College of Optometry Melbourne, Australia *Summary submitted August 24, 1970, for publication in the August, 1971, issue of the American Journal of Optometry and Archives of American Academy of Optometry. Original in Eisenbahntechnische Rundschau, 8 (7): 314-322, 1959. The complete English translation of this paper has been deposited with the National Translation Center, John Crerar Library, 35 W. 33rd Street, Chicago, Illinois 60616. Copies may be obtained from the Center, using its Translation Accession Number 70-16848. †Physicist. M.App.Sc., on study leave from Department of Supply, Defence Standards Laboratories, Melbourne, Australia.
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