. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 12 BELL SYSTEM TECHNICAL JOURNAL In the last couple of years a further step has been made by Max Knoll.^^ He seems to have simplified the operation of the tube con- siderably by attaching on the end of his tube a thin window in the manner of Dr. Coolidge's cathode ray tube. In this way the photo- graphic plate on the outside of the tube is exposed to the pencil of. Fig. 17—VVestinghouse-Norinder, 1928.^' cathode rays that has come through the thin window of metal or of
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 12 BELL SYSTEM TECHNICAL JOURNAL In the last couple of years a further step has been made by Max Knoll.^^ He seems to have simplified the operation of the tube con- siderably by attaching on the end of his tube a thin window in the manner of Dr. Coolidge's cathode ray tube. In this way the photo- graphic plate on the outside of the tube is exposed to the pencil of. Fig. 17—VVestinghouse-Norinder, 1928.^' cathode rays that has come through the thin window of metal or of cellophane. We have, then, three general classes of cathode ray oscillographs: First those that resemble the original Braun tube, still in limited use, comprising a glass tube with a fluorescent screen, and a relatively high operating voltage; second the tubes of the Dufour type that I have just described, with direct recording on the photographic plate or 16 Knoll, Max, Zeits. f. tech. Phys., 10, p. 28, 1929. " Norinder, H., A. L E. E. Trans., 47, p. 446, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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