. The principles underlying radio communication . Fig Itt Two-elect rodeEJecfron tube F - Filament P - Plate A- battery {or heating■filament b- Battery {or sendingcurrent thro 5|»aoe betw««nf>late and {/lament Fiq £54- *? »* T«m(». T-j ^r^ Tem|» Ti V 0 U i a. Plate Voltai. Characteristic, curve* ofatwo-electrode tube, -for two differenttemjae rature s Voltage VT. Pig 255 Characteristic curves of a two-electrode tube -for two differentVoltages the opposite direction. Thus both of the parts of the disruptedatom become carriers of electricity and contribute to the flowof current through the ga
. The principles underlying radio communication . Fig Itt Two-elect rodeEJecfron tube F - Filament P - Plate A- battery {or heating■filament b- Battery {or sendingcurrent thro 5|»aoe betw««nf>late and {/lament Fiq £54- *? »* T«m(». T-j ^r^ Tem|» Ti V 0 U i a. Plate Voltai. Characteristic, curve* ofatwo-electrode tube, -for two differenttemjae rature s Voltage VT. Pig 255 Characteristic curves of a two-electrode tube -for two differentVoltages the opposite direction. Thus both of the parts of the disruptedatom become carriers of electricity and contribute to the flowof current through the gas. This action of a colliding electronupon an atom is called ionization by collision, and, on accountof it, relatively large plate currents are obtained in electrontubes having a poor vacuum. The earlier tubes were of this 454 ELECTRON TUBES. sort, but at the present time most tubes are made with a bettervacuum than formerly, so that ionization by collision is respon-sible for but a small part of the current flow. At first it would seem to be an advantage to have ionizationby collision, because a larger plate current can be obtained, butthere are two difficulties which have proved so great that tubesare now usually so made as to have only the pure electron first of these difficulties is a rapid deterioration of thefilament when there is flowing a la
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
