United States or Mexico ? Vote for the TOP Country of the Week !
"Well, I want you all to have to do for once with practical life, with two hundred workmen to pay and ten thousand acres of land to see after; and artificial manures and the price of corn to worry you; then perhaps you would take a little less interest as to whether the soul was a phenomenon or an india-rubber ball, or whether men were magnets or cogwheels." Wilhelm only smiled.
Hammer tells a characteristic anecdote of Edison: "A careless boy passing through the station whistling a tune and swinging carelessly a hammer in his hand, rapped a carboy of sulphuric acid which happened to be on the floor above a 'Jumbo' dynamo. The blow broke the glass carboy, and the acid ran down upon the field magnets of the dynamo, destroying the windings of one of the twelve magnets.
In the Morse telegraph the relay permits the small current that is received from the distant sending station to energize a pair of magnets, and these draw an armature toward them and close a second circuit when a large current from a local battery is available for working the sounder.
These nerve-centers, viewed as magnets of electro-vitality, require to be regarded as having each a positive nucleus in the interior, on which are ranged the negative ends of the currents which go out from this positive nucleus in every direction to the surface of the medullary organ so radiating, as it were, from center to periphery.
Like all magnets, the earth is surrounded with ``lines of force, which, after the manner of the curved rays we saw in the photograph of a solar eclipse, start from a pole, rising at first nearly vertically, then bend gradually over, passing high above the equator, and finally descending in converging sheaves to the opposite pole.
"It is this principle which Doctor Albertson sought to make use of the lifting power of a magnet when attracted to a fixed rail of steel. He arranged a series of magnets under a miniature car running on a steel railway track. The magnets were insulated and attached to the bottom of the car so that they came under the rail and about an inch below it.
Some I can produce so sluggish and inert, that they will not act before the third failure; and others so vigorous and animated, that they exert their influence against unlawful wishes, if they have been willingly and deliberately indulged. As it is my practice honestly to tell my customers the properties of my magnets, I can judge, by their choice, of the delicacy of their sentiments.
A dozen years later, this speed had been increased to twenty miles per hour. The schoolmen of the Middle Ages had not been interested in this mysterious "electric" power. But immediately after the Renaissance, William Gilbert, the private physician of Queen Elizabeth, wrote his famous treatise on the character and behaviour of Magnets.
The screw S2 should be so adjusted as to prevent the armature actually touching the cores of the magnets when attracted. The ends of the magnet winding wire, after being scraped, are clipped tightly against the base by the binding posts T1 T2. Batteries. The dry cells used for electric bells are the most convenient batteries to use.
The same explanation is also applicable to the Deptford case, for when the dynamo is direct on, the condenser current is about 10 amperes, and this exerts only a small influence on the strongly magnetized magnets. When transformers are used, the field magnets are weak, while the condenser current rises to 40 amperes. Mr.
Word Of The Day