This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...between the electrodes depends on the rate of absorption or attraction by the plate and on the rate of emission by the filament. The steady increase of the filament temperature will increase the electron emission from the filament, and therefore also the number of electrons present in the space of the tube. This group ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...between the electrodes depends on the rate of absorption or attraction by the plate and on the rate of emission by the filament. The steady increase of the filament temperature will increase the electron emission from the filament, and therefore also the number of electrons present in the space of the tube. This group or cloud of electrons between the plate and the filament produces a negative space charge, 1 This assumes the space within the bulb to be a perfect dielectric. In case there is gas present, ionization may take place. This case is considered later. Filament Temperature Fig. 129. the effect of which upon the electrons leaving the filament is opposite to that of the plate potential. As the filament current is increased far enough, an equilibrium is reached between the opposite effects of the plate potential and the space charge, and any further increase of filament temperature produces no increase of plate current because any additional electrons in the space of the tube makes the negative space charge overbalance the positive charge on the plate and repel the emitted electrons back toward the filament. If a greater plate current is then desired, it is necessary to increase the plate potential. Thus, for every valuaf plate potential, there is a corresponding filament temperature beyond which no increase in plate current is observed. This is represented by the curves of Fig. 130. i - i i i i From the above explanation, it is seen that the maximum plate current which can be obtained for a certain value V of plate voltage, depends essentially on the shape, dimensions and spacing of the two electrodes. For a tube having a perfect vacuum, this current i, in the case of a straight filament 1 cm. long, placed along the axis of a cylindrical metal p...
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Good. Ex-library copy with usual markings. Cover shows minor wear and rubbing, pages are tanned and clean. Very Clean Copy-Over 500, 000 Internet Orders Filled.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Good. Hardcover; McGraw-Hill; stated first edition; fading, scuffing, and shelf w ear to exterior; corners bumped; stamping on front endpaper; fading to page s; otherwise in good condition with clean text, firm binding.
