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The Paris Congress decided upon adopting certain units of resistance of electromotive force, of current, and of quantity, and they determined the particular length of a column of mercury that should represent the ohm a column of mercury 106 centimeters long and of one square millimeter in section.
The electromotive force of such a cell is 1.03 volts, and a current equivalent to one volt passing through a resistance of one ohm was found to decompose 0.00146 grain of water in one second. The battery is divided into "cabinets," which hold from 1,200 to 2,160 small elements each. This facilitates removal, and also the detection of any fault that may occur.
Hence we quote the following notes he made, November 15, 1878, in one of the laboratory note-books: "A given straight wire having 1 ohm resistance and certain length is brought to a given degree of temperature by given battery.
"I was having dinner with your father at the Octagon." The high tension voltage of that bright blue current felt like ohm sweet ohm, but Aubrey dared not risk too much of it at once. Fearing to blow out a fuse, he turned in panic to Mrs. Mifflin. "You see," he explained, "I write a good deal of Mr. Chapman's advertising for him. We had an appointment to discuss some business matters.
As the cylinder still continues to dip into the blacking, the latter is thus spread ever the brush. La Genie Civil. A.E. Dolbear. He says that a Holtz machine may give through a short wire a very strong current. For if E = 50,000 volts, R = 0.001 ohm, then C = 50000/0.001 = 50,000,000 amperes. Now that is a very large quantity of electricity, and is equal to an enormous horse power.
I have obtained with piles arranged like those shown in the figures nearly 0.06 ohm, the measurements having been taken from a newly charged pile. After this the carbon is washed and put back into the exciting liquid. "These reductions of the chloride of silver during the operation of the pile can be reproduced ad infinitum, since they are accompanied by no loss of metal.
When sounds vibrate the ribbon extremely low alternating voltages are developed at the ends of the ribbon, which has a very low impedance of only 0.15 ohm, necessitating the use of a step-up transformer of 1:45 turns ratio very close to it. The frequency response is 20 to 16,000 Hz.
If I should sum up my opinion of massage in the reduction of intra-ocular tension, I would say that it is useful in enhancing the action of myotics, and particularly useful, as Domec, Knapp, Ohm, Weeks and many others have shown, after the filtering angle has been opened by a proper operative procedure.
The relation between these is expressed by the well-known law of Ohm, which runs: A current of electricity is directly proportional to the electromotive force and inversely proportional to the resistance of the circuit. In practice electricity is measured by various units or standards named after celebrated electricians.
"Would you be so kind as tell me, sir, what's a ohm?" said the worthy Mr. Stiggins to me the other day. "It's a modern term used in electricity, which I am too ignorant to explain to you." He looked full at me for more than five seconds without a word then he said, "I'm thinking that this man was a fool to talk about ohms when not even you knew what a ohm means.
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