Annual report of the Board of Regents of the Smithsonian Institution . in con-nection with a receiving antenna, as shown in figure 18, and used witha galvanometer or telephone. Mr. Marconi subsequently added aninduction coil and condenser, and employed in 1907 the arrangementsshown in figure 19. In this case the trains of oscillations set up inthe antenna could not by themselves affect a galvanometer or a tele- 1 J yf y ^.^?^^3 C^ ^ /? ZX ^ o>^^^ 1Second_I)i_%£ntiaJ Curve_ y -i Fr;. 0 12 14 16 18 4 6 8 10 AjipUed curve of rarcflod gas ionized bytiot negative ele
Annual report of the Board of Regents of the Smithsonian Institution . in con-nection with a receiving antenna, as shown in figure 18, and used witha galvanometer or telephone. Mr. Marconi subsequently added aninduction coil and condenser, and employed in 1907 the arrangementsshown in figure 19. In this case the trains of oscillations set up inthe antenna could not by themselves affect a galvanometer or a tele- 1 J yf y ^.^?^^3 C^ ^ /? ZX ^ o>^^^ 1Second_I)i_%£ntiaJ Curve_ y -i Fr;. 0 12 14 16 18 4 6 8 10 AjipUed curve of rarcflod gas ionized bytiot negative electrode. 180 ANNUAL EEPOET SMITHSONIAN INSTITUTION, 1909. phone, but when rectified by the valve they become equivalent to anintermittent unidirectional current, and can then affect the telephoneor a galvanometer, or any instrument for detecting a direct current. On the other hand, we may take advantage, as I have more recentlyshown, of the nonlinear form of the characteristic curve. In otherwords, of the fact that the conductivity of the ionized gas is a func-. -AAAMA/VAV-J I—=—J
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