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Next shunt a potentiometer around the A battery and connect the third post, which connects with the sliding contact, to the negative or zinc pole of a B battery, then connect the positive or carbon pole of it to the negative or zinc pole of a second B battery and the positive or carbon pole of the latter with one end of the primary coil of the second audio frequency transformer and the other end of it to the plate of the first amplifying tube.
John Gordon of the Spindrift staff about the principles of radio. Dr. Gordon had sketched a circuit that needed no power, and then had told Rick of how American ingenuity had produced what soldiers called a "foxhole radio." "I saw an old transformer in the woodshed," he said suddenly. "May I have it, Dr. Miller?" At the scientist's nod, he addressed Jan. "I'll bet you can find me a cardboard tube.
Such a view brings them more near to us, helps us to neglect mere differences of language and appearance, and grasp the warmly living and contemporary character of all historic truth. It preserves us, too, from the common error of discriminating between so-called "ages of faith" and our own. The more we study the past, the more clearly we recognize that there are no "ages of faith." Such labels merely represent the arbitrary cuts which we make in the time-stream, the arbitrary colours which we give to it. The spiritual man or woman is always fundamentally the same kind of man or woman; always reaching out with the same faith and love towards the heart of the same universe, though telling that faith and love in various tongues. He is far less the child of his time, than the transformer of it. His this-world business is to bring in novelty, new reality, fresh life. Yet, coming to fulfil not to destroy, he uses for this purpose the traditions, creeds, even the institutions of his day. But when he has done with them, they do not look the same as they did before. Christ himself has been well called a Constructive Revolutionary, yet each single element of His teaching can be found in Jewish tradition; and the noblest of His followers have the same character. Thus St. Francis of Assisi only sought consistently to apply the teaching of the New Testament, and St. Teresa that of the Carmelite Rule. Every element of Wesleyanism is to be found in primitive Christianity; and Wesleyanism is itself the tradition from which the new vigour of the Salvation Army sprang. The great regenerators of history are always in fundamental opposition to the common life of their day, for they demand by their very existence a return to first principles, a revolution in the ways of thinking and of acting common among men, a heroic consistency and single-mindedness: but they can use for their own fresh constructions and contacts with Eternal Life the material which this life offers to them. The experiments of St. Benedict, St. Francis, Fox or Wesley, were not therefore the natural products of ages of faith. They each represented the revolt of a heroic soul against surrounding apathy and decadence; an invasion of novelty; a sharp break with society, a new use of antique tradition depending on new contacts with the Spirit. Greatness is seldom in harmony with its own epoch, and spiritual greatness least of all. It is usually startlingly modern, even eccentric at the time at which it appears. We are accustomed to think of "The Imitation of Christ" as the classic expression of mediæval spirituality. But when Thomas
With Direct Current. When a 110 volt direct current is used to energize the power transformer an electrolytic interruptor is needed to make and break the primary circuit, just as a vibrator is needed for the same purpose with a spark coil.
This current sets up an alternating magnetic field in the core of the transformer and as these magnetic lines of force expand and contract they set up alternating currents of the same frequency but of much higher voltage at the terminals of the secondary coil according to the ratio of the primary and secondary turns of wire as explained under the sub-caption of Ratio of Transformation.
Alternation Current Power Transformer. Connecting Up the Apparatus. It will be observed that a storage battery is not needed as the secondary coil of the transformer supplies the current to heat the filament of the oscillator.
Faraday not only gave to the world the first electric generator, but also the first transformer, and one of the first electric motors, and without these gifts the electric transmission of power over long distances, which has justly been regarded as one of the most marvellous achievements of our age, would have been an impossibility.
The transformer raises the voltage and sends the electrical current under high pressure over a small wire and so great is this pressure that thousands of horse-power can be sent to great distances over small wires with very little loss.
The employment of an intense magnetic field is of advantage principally when the induction coil or transformer which charges the condenser is operated by currents of very low frequency. In such a case the number of the fundamental discharges between the knobs may be so small as to render the currents produced in the secondary unsuitable for many experiments.
Magnus is as good an electrician as he is a chemist, and he could easily rig up some kind of transformer reducing the power of the current just enough to paralyze the victim death by a myriad of small shocks instead of one big one. Now it is plain why the spider will not come to spring his trap unless the sun shines on the 21st of March.
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