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He also considered various forms and shapes for the armature, and by methodical and systematic research obtained the data and best conditions upon which he could build his generator. In the field magnets of his dynamo he constructed the cores and yoke of forged iron having a very large cross-section, which was a new thing in those days.
As already stated, he never accepted a negative answer to an experiment until he had brought to bear upon it all the force at his command. He had over and over again tried steel magnets and ordinary electro-magnets on various substances, but without detecting anything different from the ordinary attraction exhibited by a few of them. Stronger coercion, however, developed a new action.
For the sake of clearness we will speak of magnetic induction as that property of a magnet by which it is surrounded by a field of force, and by which pieces of iron, within that field, are converted into magnets, and pieces of bismuth into diamagnets, and we will speak of magnetic action as the property of a magnet by which it attracts or repels another magnet, or by which it attacks or repels a piece of iron or bismuth magnetized by magnetic induction.
This magnetic tack hammer picks up the tacks of its own accord, and the man drives them in the basket as fast as he can touch the magnet to the heads of the tacks and strike the basket. In the great steel works where armor plate is made powerful magnets are used to carry the hot plates from one place to another.
You see, many coils are wound around the barrel of the gun. As the projectile starts it does so under the attraction of those coils ahead which the current makes temporary magnets. It automatically cuts off the current from those coils that it passes, allowing those further on only to attract it, and preventing those behind from pulling it back." He paused to study the scraps of plans.
When fewer glow lamps are in the external circuit E, and its resistance therefore higher, the current in the shunt circuit M is greater than before, the magnets become stronger, and the electromotive force of the armature is increased.
After Marina had gone, Kennedy stretched a curtain over the end of the room farthest from the cabinet. Behind it he placed on a shelf the apparatus composed of the pendulums and magnets. The beakers and test-tubes were also on this shelf. He had also arranged that the cabinet should be so situated that it was next a hallway that ran past his laboratory.
The law is arbitrary and invariable under all circumstances, and is a law of nature, as unexplainable and as invariable as any in that mysterious code. All bar magnets, when suspended by their centers, turn their ends to the North and South, a familiar example of this being the ordinary compass. But in magnetism, like repels like. The world is a huge magnet.
A loving heart and a sympathetic word, the exhibition of a Christian life and conduct, the fact of going down into the midst of evil and trying to lift men out of it, are the old-fashioned and only magnets by which men are drawn to purer and higher life. That is God's way of saving the world by the action of single souls on single souls. Masses of men can neither save nor be saved.
A single needle is not relied upon to secure the direction of the card, the latter being attached to a system of four or even more magnets, all pointing in the same direction. The compass must have no iron in its construction or support, because the attraction of that substance on the needle would be fatal to its performance.
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