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578 BERKLEY AND MANSBERG
with the problem of their proper interpretation. One of the best devices that we have found for evaluating oscillograms, either singleframe or continuous-motion, is a standard microfilm reader which gives an image about fifteen times normal size or three times that on a standard 5-inch oscillograph. The use of such a microfilm reader or of a projector, usually enables the appreciation of details which would otherwise go unnoticed.
In this paper, we have attempted to clarify some of the factors which the oscillographer should consider in choosing, specifying, and using photographic equipment. It is believed that proper use of this information correlated with that in standard photographic texts, and in the catalogs of some oscillograph manufacturers, will result in considerable economy in photographic work and in oscillograms which are far superior to those which are sometimes found in the present literature.
REFERENCES
(1) H. P. Mansberg, "A new, versatile camera for the cathode-ray oscillograph," The Oscillographer, vol. 10, p. 2; October-December, 1948.
(2) C. E. Kenneth Mees, "The Theory of the Photographic Process," The Macmillan Company, New York, New York, 1942, pp. 236-260.
(3) Rudolf Feldt, "High speed photographic recording and projection oscillography with the new DuMont Type 5RP multiband tube," The Oscillographer, vol. 7, p. 1; JulyAugust, 1945.
(4) C. Berkley, "Suppression of halo around the CRT spot," Unpublished Internal Engineering Report No. 24, Allen B. DuMont Laboratories, April 5, 1943.
(5) R. Feldt, "Long persistence CR tube screens," Elec. Ind., vol. 5, p. 70; October, 1946.
(6) R. Feldt, "Luminescent screens for cathode-ray oscillography," The Oscillographer, vol. 11, p 3; AprilJune, 1949.
(7) W. Nethercot, "Recording of high speed transient phenomena," Elec. Eng., vol. 16, p. 369; February, 1944.
(8) P. S. Christaldi, "The evaluation of specifications for cathode-ray oscillographs," Technical Paper delivered at IRE National Convention, March 7-10, 1949.