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Powerful magnets outside the door had been used to turn the key and push the bolt within. Murderers armed with magnets loomed on the popular imagination like a new microbe. There was only one defect in this ingenious theory the thing could not be done.
This arrangement is simpler in construction than the bobbin winding, and is less liable to generate self-induction current in the armature. Sir William Thomson has adopted a similar plan in one of his dynamos. The field magnets are also wound in a similar manner. It will be seen from our description that Drs.
The successive magnets are charged oppositely, the sections being divided halfway between by insulators, the nature of the electricity in each section being governed by the charge in the magnet.
Then he crawled in under the wagon, reappearing with a lick of grease over one eye. "It gets me," he said. "I ran a little oil out of the crank-case on general principles, and chased up the magnets but everything's tip-top as far as I can see!" "Suppose you crank up and let's try again," said the girl. But the car went worse than ever.
The essential points of construction being worked out, improvements followed rapidly. Dr. Werner Siemans, of Berlin, introduced an important modification by making the revolving armature of a cylinder of soft iron, having a groove cut throughout its length on opposite sides. In these grooves a wire was wound and the armature was rotated on its axis between the poles of several magnets.
Knowledge. The action of magnets upon the voltaic arc has been known for a long time past. Davy even succeeded in influencing the latter powerfully enough in this way to divide it, and since his time Messrs. Grove and Quet have studied the effect under different conditions.
Our preconceived ideas act like magnets on the material of evidence which is submitted to us, instinctively selecting what bears in their favour and declining to receive what they cannot utilise. Nowhere is this more conspicuous than in the field of religious inquiry, nor is it confined to either believers or unbelievers.
This batch of material goes back for another crushing, so that everything is subjected to an equality of refining. We are now in sight of the real 'concentrates, which are conveyed to dryer No. 2 for drying again, and are then delivered to the fifty-mesh screens. Whatever is fine enough goes through to the eight-inch magnets, and the remainder goes back for recrushing.
Altogether there were about four hundred and eighty of these immense magnets in the plant, distributed in various buildings in batteries as above mentioned, the crushed rock containing the iron ore being delivered to them by conveyors, and the gangue and ore being taken away after separation by two other conveyors and delivered elsewhere.
The little herons and I watched them come first a single white egret, which spiralled down, just as I had many times seen the first returning Spad eddy downward to a cluster of great hump-backed hangars; then a trio of tricolored herons, and six little blues, and after that I lost count. It seemed as if these tiny islands were magnets drawing all the herons in the world.
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