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Updated: June 10, 2025
I trimmed right down, hoping to avoid being seen, as it was essential to stay on the surface and get some amperes into the battery. I also altered course away from him. It was about 5 p.m. that I saw two trawlers ahead, one on each bow. By this time the boat's crew had quite recovered, but I did not wish to dive, as the battery was still pitiably low.
It is evidently important that the deposited material should be so firmly adherent that it can be washed, dried, and weighed without loss in handling. In prescribing analytical conditions it is customary to state the current strength in "normal densities" expressed in amperes per 100 sq. cm. of electrode surface, as, for example, "N.D = 2 amps."
Then if the purpose be to establish such a standard of measurement, the scale must be expressed in units of the same denomination as that of our own nature you cannot divide miles by ampères and it is because the scale of our potential being is laid out in the same denomination as that of the Spirit of Life itself that we can avail ourselves of the standard of "the Word made Flesh."
That is, if you multiply the resistance of the circuit in ohms by the current in amperes the result will give you the electromotive force in volts. From this you will see that if you know the value of any two of the constants you can find the value of the unknown constant by a simple arithmetical process.
One particular unit delivered 422 amperes at 12,000 volts. The beauty of this system was that the voltage could be stepped down using transformers for local use, or stepped up to many thousands of volts for transmission over long distances through relatively thin conductors. Edison's generating stations were incapable of any such thing.
An iron bar was also used, polished, and with a man standing on it to insure solid contact; but only one thousand amperes passed through it i.e., the amount required by a single car, and, of course, much less than the capacity of the generators able to operate a system of several hundred cars.
The electro deposition of zinc has been subject to many patents, and the efforts to introduce it have been lamentable in both a mechanical and financial sense. Most authorities recommend a current density of 18 or 20 ampères per square foot of cathode surface, and aqueous solutions of zinc sulphate, acetate or chloride, ammonia, chloride or tartrate, as being the most suitable for deposition.
A 2 horse motor of 82 per cent. efficiency with 9 amperes of current will require about 200 volts to develop 2 actual H. P. Two hundred volts therefore is what the electric light company contract to deliver, while, in reality, they deliver only 129 volts or 60 percent., or a minimum average of 90 volts or 45 per cent. of the power contracted for.
"I don't have a direct reading on this," he explained, "but an indirect reading from the magnetic field in that room shows a current of nearly a hundred million amperes!" The younger Morey had been watching a panel of meters on the other side of the screen. Suddenly, he shouted: "Cut it, Arcot! The conductors are setting up a secondary field in the plate and causing trouble."
This very simple arrangement answers every requirement, and, upon placing a sensitized plate in the vicinity of the conductors, permits of photographing the electric discharge directly and, so to speak, before the eyes of the operator. As a source of electricity, use is made of a bichromate of potash battery of 6 elements, capable of giving 10 volts and 15 amperes.
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