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Updated: June 2, 2025
If we magnetize a wire placed east and west, it will retain this polarity until freed by vibrations, as already remarked. If we pass an electric current through this magnetized wire, we can notice the gradual rotation of the molecules, and the formation of the circular neutrality. If we commence with a weak current, gradually increasing its strength, we can rotate them as slowly as may be desired.
"There is a pretty high vacuum in that aluminum case," went on Norton. "There's very little friction on that account. The power to rotate the flywheel is obtained from this little dynamo here, run by the gas-engine which also turns the propellers of the aeroplane." "But suppose the engine stops, how about the gyroscope?" I asked sceptically. "It will go right on for several minutes.
It is of some interest, in conjunction with the historical Arago experiment, to mention that in lag or phase motors I have produced rotation in the opposite direction to the moving field, which means that in that experiment the magnet may not rotate, or may even rotate in the opposite direction to the moving disc.
Few thought of fertilizing their land; terracing against rains and floods was almost unknown, and for most farmers plowing was done up and down the hills, which only hastened the washing-away process so characteristic of the Southern agriculture. Very few farmers thought it worth while to rotate their crops when fresh lands were to be had at a few dollars an acre.
To the left of this coil was a large relay switch, and a rheostat control. "Turn on the relay, Dad, then slowly rotate the controller to the left. And remember that it is rather powerful; I know this doesn't look like a solar engine, and nine o'clock at night seems a peculiar hour to demonstrate such a thing, but I'll guarantee results probably more than you expect." Dr.
And now he turned the light of these discoveries upon the darkest physical phenomenon of that day. Arago had discovered, in 1824, that a disk of non-magnetic metal had the power of bringing a vibrating magnetic needle suspended over it rapidly to rest; and that on causing the disk to rotate the magnetic needle rotated along with it.
The cover being closed, the carbon disulphide is admitted, and passing through the wool, the greasy matter is dissolved, and along with the solvent enters a reservoir. The machine is now set in motion, and the bulk of the solvent is drawn off. Cold water is then admitted, and the machine being again caused to rotate, the whole of the bisulphide is expelled.
A longitudinal missile must rotate with its axis coincident with its line of flight as it leaves the barrel, or else every rotation will throw the point into wider circles, until finally it becomes more eccentric than a round ball.
The defect in this grindstone was not so serious but that the stone might perhaps have been ground out with fair treatment: but, by fixing a small pulley-wheel, Simmons had caused it to rotate at furious speed. This tried it too hard, and it flew in two pieces, just as the grinder was pressing down a heavy saw on it with all his force.
These points were arranged to receive an electrical discharge from a frictional machine, the discharge causing the wheel to rotate. There was very little force given to this rotation, however, not enough, in fact, to make it possible to more than barely turn the wheel itself.
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