The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 35
n streamwill therefore generally spread out as the distance from thecathode increases. This spreading can be prevented by means of amagnetic field applied in a suitable way to the stream. In Fig.4 let C be the hot cathode, P an anode and A an electrode withan aperture in its center. Let A and P be… … Fig. 4. Fig. 5. and A their velocitj- will be continually increased by the electricfield existing between C and A, but after passing A they willcontinue to move with the same velocity which they had onreaching A, since A and P are at the same potential. If now amagnetic field in the direction AP be…
Telegraph, Wireless
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