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- W2072250339 abstract "The electrical potentials generated in the cerebral cortex may ultimately have considerable clinical as well as physiologic significance. Preliminary observations on these phenomena were carried out with a string galvanometer and a direct current amplifier<sup>1</sup>and with a cathode ray oscillograph and a capacity-coupled amplifier,<sup>2</sup>but it was soon evident that the most significant electrical waves had frequencies below 30 cycles per second and might therefore be successfully recorded by means of an ink-writing oscillograph. The advantages of obtaining an immediate permanent record on a paper tape at a cost of 1 cent per hundred feet are obvious. The problem was to obtain an ink-writing oscillograph with as high a frequency range as possible and to construct an amplifier to deliver to it sufficient current for its operation. Ink-writing oscillographs for this purpose have already been developed by Toennies<sup>3</sup>and by Adrian and Matthews,<sup>4</sup>but we" @default.
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- W2072250339 date "1935-12-01" @default.
- W2072250339 modified "2023-09-27" @default.
- W2072250339 title "AN INK-WRITING ELECTRO-ENCEPHALOGRAPH" @default.
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- W2072250339 doi "https://doi.org/10.1001/archneurpsyc.1935.02250240161012" @default.
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