The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 184
from cathode to anode. Let us consider thecase of a single electron emitted from the cathode. In moving THE THERMIONIC AMPLIFIER 161 through the cathode surface it has to do an amount of workequivalent to the electron affinity and in moving from cathodeto anode it has to do work in overcoming the… … forces is generally small and never amounts to more than a drop ofa few volts. If these were the only forces exerted on a large num-ber of electrons escaping from the cathode the application of a smallvoltage between cathode and anode would almost immediatelygive rise to the saturation current, and…
Telegraph, Wireless
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