The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 79
12, p. 147, 1915, 56 THERMIONIC VACUUM TUBE plates Is practically constant so that the potential distribution is alinear function of A^, the distance from the plate C, and can berepresented by a straight hne OP. But this is no longer the casewhen C emits electrons. These electrons are pulled over… … Distance from Coi+hodeFig. 19. lines of force are straight the potential T at any point distant xfrom C is given b} cPV ^==-*^ ^1) where p is the volume density of the charge. Now p is itself afunction of x. Thus (PVd7= = ^-/« (2) The relation between the potential T and the distance x cannot…
Telegraph, Wireless
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