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Updated: May 10, 2025
This tube is made like the amplifier tube described for use with the preceding experimental transmitter, but it is larger, has a more perfect vacuum, and will stand a plate potential of 350 volts while the plate current is .045 ampere. The filament takes a current of a little more than 2 amperes at 7.5 volts. A standard 4-tap base is used with it.
"Hey!" he cried, angrily, as Tom speeded past, "don't you know you got to give warnin' when you're comin' with one of them ther gol-swizzled things! By Jehossephat I'll have th' law on ye ef ye do thet ag'in!" "I forgot to ring the bell," apologized Tom, as he sent out a peal from the gong, and then, he let out a few more amperes, and the speed increased. "Hold on!
A movable contact arm that slides over and presses on the turns of wire is fixed to the knob on top of the rheostat. A rheostat that has a resistance of 6 ohms and a current carrying capacity of 1.5 amperes which can be mounted on a panel board is the right kind to use. Assembling the Parts.
This is found by multiplying its ordinary chemical equivalent or combining weight by .000010384, which is the electrochemical equivalent of hydrogen. Thus the weight of metal deposited from a solution of any of its salts by a current of so many amperes in so many seconds is equal to the number of amperes multiplied by the number of seconds, and by the electrochemical equivalent of the metal.
It is not advantageous to withdraw the whole amount of energy put in; although its charging capacity is as much as 370 ampere hours, we do not use more than 80 per cent., or 300 ampere hours; hence, if we discharge these accumulators at the rate of 40 amperes, we obtain an almost constant current for 71/2 hours: one cell gives an E.M.F. of two volts.
The next point was to secure a joint between contiguous rails such as would permit of the passage of several thousand amperes without introducing undue resistance. This was also accomplished. Objections were naturally made to rails out in the open on the street surface carrying large currents at a potential of twenty volts.
According to the inventor's experiments, the square meter of active surface can receive a charging current of 10 amperes, and furnish on discharging a current of the intensity of 20 amperes. For a "No. 10" accumulator we have an active surface of 10 square meters, a charging current of 100 amperes, and on discharging a current of 200 amperes.
A volt meter across the terminals of the motor gave the following readings with the current at 9 amperes: Minimum 90 volts, maximum 148 volts, average 119, which gives us a minimum average per operator of 4.5 volts and a maximum average of 7.4 volts, or a general average of 5.9 volts per operator.
Bruce asked himself, eying the idler sharply as he passed, "or is that hombre tagging me around?" Bruce's thoughts were a jumble of dynamos and motors, direct and alternating currents, volts and amperes, when James J. Jennings' papier-mache suitcase hit him in the shins in the lobby of a hotel which was headquarters for mining men in the somnolent city on the Pacific coast.
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