The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 53
end of the filament, thegalvanometer showed no deflection. Astudy of this effect, which is sometimescalled the Edison Effect was madeby J. A. Fleming in 1896,^ but the truenature of the phenomenon was notunderstood until the work of J. J. Thomson and O. W. Richardson.In 1899, the former showed ^… … Fig. 7. ELECTRONS FROM SOLID SUBSTANCES 31 of electrons. This explained, for example, why in the Edisoneffect a current was observed to flow thiough the galvanometerG. When the plate was connected to the positive end of thefilament, the filament had a negative potential with respect to theplate,…
Telegraph, Wireless
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