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The alternating or see-saw current in this case charges the condenser and excites the primary coil P, while the induced current in the secondary coil 5 charges the terminal plates T T. So long as the bulbs or tubes are kept within the space between the plates, they are filled with a soft radiance, and it is easy to see that if these plates covered the opposite walls of a room, the vacuum lamps would yield a light in any part of it.

Why, sir, you told us you were going to turn over the pole a bit and freeze up Europe. I was up here loading the condenser when you cut me off from the alternator. I opened the switch and put on the electrometer to see if we had enough. Next everything was clouded, and I went over to the window to see what was going on." "Yes," commented Bennie approvingly, "all right so far. What happened then?"

At the end of this time I arose, and found myself freer from absolute pain of any kind than I had been during the last hour and a quarter of my ascension. The difficulty of breathing, however, was diminished in a very slight degree, and I found that it would soon be positively necessary to make use of my condenser.

Being port engineer, he investigated the engine room and found that his favorite monkey wrench had been lost; there were two leaky tubes in the main boiler; the ash hoist was out of kilter; his successor in the Narcissus was carrying ten pounds of steam less than Terence used to carry; and there was something not quite right with the condenser.

"You must think they are combination locks," laughed Bob. "This knob here controls a condenser, and this one a transformer." "But how do you know what to do with them?" asked the bewildered Larry. "How do you know which one to turn and which one to leave alone?" "You don't," laughed Bob. "You may have an idea about where they should be placed, but it's different every evening."

Thus one is led, from theoretical and practical considerations, to the use of high frequencies, and this means high electromotive forces and small currents in the primary. When he works with condenser charges and they are the only means up to the present known for reaching these extreme frequencies he gets to electromotive forces of several thousands of volts per turn of the primary.

Now there is only one method by which currents of high frequency, or radio-frequency, as they are termed, can be set up by spark transmitters, and this is by discharging a charged condenser through a circuit having a small resistance.

The apparatus for this set includes: an alternating current transformer, a wireless telegraph key, a fixed, a rotary, or a quenched spark gap, a condenser, and an oscillation transformer.

A. The steam, after having performed its office in the cylinder, is permitted to pass into a vessel called the condenser, where a shower of cold water is discharged upon it. The steam is condensed by the cold water, and falls in the form of hot water to the bottom of the condenser.

The train and also each signalling station were equipped with regulation telegraphic apparatus, such as battery, key, relay, and sounder, together with induction-coil and condenser. In addition, there was a transmitting device in the shape of a musical reed, or buzzer. In practice, this buzzer was continuously operated at high speed by a battery.