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Updated: June 21, 2025
This may be so, but the larger the number of plates, the less the engine power required, and the longer they last. In each section the electrodes are in parallel, and any one section is in series with the other, the arrangement being exactly like that of a series of primary battery cells.
Then the charged positive ions travel in the direction of the electromotive force and the negative ions in the opposite direction. On reaching the electrodes they yield up to them the charges they carry, and thus pass from the state of ion into that of ordinary atom.
Edison was the first to make apparatus in which carbon was used as one of the electrodes.... The carbon transmitter displaced Bell's magnetic transmitter, and, under several forms of construction, remains the only commercial instrument.... The advance in the art was due to the carbon electrode of Edison.... It is conceded that the Edison transmitter as apparatus is a very important invention.... An immense amount of painstaking and highly ingenious experiment preceded Edison's successful result.
"With the electric arc, sir," answered the chemist, mopping his brow. This grilling method reminded him of what he had heard of "Third Degree" torments. "That's the best method, sir." "Now in use, anywhere?" "In Notodden, Norway. They have firebrick furnaces, you understand, sir, with an alternating current of 5000 volts between water-cooled copper electrodes.
It should be noted that, in general, the changes occurring at the cathode are reductions, while those at the anode are oxidations. For analytical purposes, solutions of nitrates or sulphates of the metals are preferable to those of the chlorides, since liberated chlorine attacks the electrodes.
First of all men after the discoverer, Robert saw the gold mass, when the electrodes were again applied to it, change swiftly and successively to barium, to tin, to silver, to copper, to iron. He saw the long white electric sparks change to crimson with the strontium, to purple with the potassium, to yellow with the manganese.
"Out in my shop, running yet if it hasn't been frightened by the airship smash," replied the lad, somewhat proudly. "It's an oxide of nickel battery, with steel and oxide of iron negative electrodes." "What solution do you use, Tom?" asked Mr. Swift. "I didn't get that far in questioning you before the crash came," he added.
When the conducting cords are of equal length, as commonly they should be, each of the two poles or electrodes produces a polar effect in the patient directly the opposite of that produced by the other.
A channel is kept at the bottom of the electrodes for the silt to collect, with a culvert at side to flush it into, so as to prevent any block occurring; the advantage of this is obvious. The plates in each section may be from half an inch to an inch thick, and can be of any length up to 6 ft. It may possibly be objected that a large number of plates is required.
Now whenever any pair of electrodes on the rotating disk are in a line with the pair of fixed electrodes a spark will take place, hence the pitch of the note depends on the speed of the motor driving the disk. This kind of a rotary spark-gap is called non-synchronous and it is generally used where a 60 cycle alternating current is available but it will work with other higher frequencies.
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