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There are two ways to set up the sparks and these are: with an induction coil, or spark-coil, as it is commonly called, and with an alternating current transformer, or power transformer, as it is sometimes called.
Truly rain is a marvellous transformer; not only vegetable but animal life is affected by it; the bush is enlivened by the twittering of small birds, which come from nobody knows where, build their nests, hatch out their young, and disappear! Almost every bush held a nest, usually occupied by a diamond-sparrow.
"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."
When these electrodes are connected in series with the primary of a large spark coil or an alternating current transformer, see C, and a direct current of from 40 to 110 volts is made to pass through it, the current is made and broken from 1,000 to 10,000 times a minute.
The Oscillation Transformer. With an oscillation transformer you can tune much more sharply than with a single inductance coil tuner. The primary coil is formed of 6 turns of copper strip, or No. 9 copper wire, and the secondary is formed of 9 turns of strip, or wire. The primary coil, which is the outside coil, is hinged to the base and can be raised or lowered like the lid of a box.
+830+. In all these cases the creation is out of already existing material and the creator is really a culture-hero or transformer, a character that clings to deities in the most advanced religions, as the Egyptian, Babylonian, and Greek. The character of these early transformers and creators is that of the communities in which they originate.
The entire space within was not more than ten feet wide and eight feet deep. It held a litter of plumber's tools, a few lengths of gas piping, a row of batteries, a blowpipe, a small hand-forge, a couple of porcelain washbowls, a deal table and chair and what seemed to be an electric transformer in a sadly battered case.
To employ a single phase current, motors of either the repulsion type or of the series type are used and are of heavier weight than the direct current motors, as they must combine the functions of a transformer and a motor.
Where either a radio frequency transformer, that is one without the iron core, or an audio frequency transformer, that is one with the iron core, is used to couple the amplifier tube circuits together better results are obtained than where a high resistance grid leak is used, but the amplifying tubes have to be more carefully shielded from each other or they will react and set up a howling noise in the head phones.
And soon the three Terrestrials, without armor, without arms, and almost without clothing, were standing in the control room, again facing the calm and unmoved Nerado. To the surprise of the impetuous Costigan, the Nevian commander was entirely without rancor. "The desire for freedom is perhaps common to all forms of animate life," he commented, through the transformer.