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Updated: June 21, 2025
In the latter case, unless some judgment is used, one of the electrodes might glow more intensely than the other. But on the whole I find it preferable when using such high frequencies to employ only one electrode and one connecting wire.
From this it will be seen that what in practice are designated as the positive and negative posts, and also positive and negative poles or electrodes are not such in relation to each other, but the reverse of it; that is to say, the positive post is not positive in relation to the negative post, but is negative to it; and the positive electrode or pole is not positive in relation to the negative electrode, but negative to it.
The last especially made a notable advance when, in the course of his studies on the "prismatic decomposition" of the electric light, he reached the significant conclusion that the rays visible in its spectrum were different for each kind of metal employed as "electrodes."
When he uses tin-foil electrodes on the outside of the bulb, he protects the tin-foil edges, and, what is more essential, uses extremely small Leyden jars and a short spark gap between the poles of the discharging rods. From a photograph by Professor Arthur W. Wright of Yale College, taken through an ebonite plate-holder with fifty-five minutes exposure.
When the cords are of equal length, this point will always be in the person of the patient, about midway between the parts where the two electrodes are applied.
The lamp used by Sir Humphry Davy at the Royal Institution, at the beginning of the present century, was an arrangement of two carbon pencils, between which was formed the "electric arc" by the intensely-vivid incandescence and combustion of the particles of carbon passing between the solid carbon electrodes.
The cause of the unsatisfactory character of the deposit is apparently sometimes to be found in the coincident liberation of considerable hydrogen and sometimes in the failure of the rapidly deposited material to form a continuous adherent surface. The effect of rotating electrodes upon the character of the deposit is referred to below.
The Berliner patent was declared invalid, and in the course of a long and exhaustive opinion, in which the state of art and the work of Bell, Edison, Berliner, and others was fully discussed, the learned Judge made the following remarks: "The carbon electrode was the invention of Edison.... Edison preceded Berliner in the transmission of speech.... The carbon transmitter was an experimental invention of a very high order of merit.... Edison, by countless experiments, succeeded in advancing the art. . . . That Edison did produce speech with solid electrodes before Berliner is clearly proven.... The use of carbon in a transmitter is, beyond controversy, the invention of Edison.
The Telegraph Key. The Spark gap. It is in the spark gap that the high tension spark takes place. The apparatus in which the spark takes place is also called the spark gap. It consists of a pair of zinc plugs, called electrodes, fixed to the ends of a pair of threaded rods, with knobs on the other ends, and these screw into and through a pair of standards as shown at c.
I don't care about having her put through it, but I want her to know exactly the kind of a guy she is getting." Dorothy protested at this, but as all four were eager that they themselves should be tested, the Karfedix was notified and Dunark clamped sets of multiple electrodes, connected to a set of instruments, upon the temples of his father, Dorothy, and Seaton.
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