If set in rotation around its axis of figure PP, it will continue to rotate around that axis for an indefinite time.
There would naturally be some places in this ring denser than others; these would gradually absorb all the ring into a planet, and still revolve about the central mass, and still rotate on its own axis, throwing off rings from itself.
If Jupiter should rotate four times more rapidly than it does, it could not be held together compactly.
If the water should become lighter in an infinitesimal degree, or the world rotate more slowly, the poles would be submerged and the equator become an arid waste.
Without a load the needles will rotate freely more than a thousand hours on the primary impulse, as against a few minutes in the old type; and under load they are many thousands of times as sensitive.
Additional fast and slow motions must, of course, be provided to rotate the mechanism upon each graduated circle at the will of the operator.
For fine yarns the rollers cease to rotate slightly before the carriage has attained the end of its outward run, or stretch, and at such times all attenuation is due to the pull of the spindles upon the threads.
In order to avoid such vibration Mr Danforth, in or about 1829, placed an inverted cup upon the top of a stationary spindle, and upon the spindle a freely fitting sleeve and wharve; the former to receive a spool, the latter to rotate both.
To turn round rapidly; to cause to rotate with velocity; to make to revolve.
To be turned round rapidly; to move round with velocity; to revolve or rotate with great speed; to gyrate.
The aluminum disc is so arranged that when the shaft turns in one direction the torque of the magnet tending torotate it decreases, while the torque of the other magnet increases.
The compensating torque must not cause the moving element to rotate or "creep" without current in the series coil.
The magnet then begins to rotate continuously without being able ever to attain equilibrium; this is Faraday's experiment.
I will pause longer on the case of relative motions referred to axes which rotate uniformly.
As the disks rotate and the speed increases the path of the steam lengthens until it completes a number of turns before reaching the outlet--and it is working all the time.
All the planets, with the exception probably of Uranus, rotate in a plane that is nearly the same as the plane of the orbit in which they revolve.
Even, therefore, if the moon at any time began to rotate faster than the earth, the earth acting on its projecting surface retarded it until the time of its rotation agreed exactly with the time of its revolution.
Moreover, with the exception of probably both Uranus and Neptune, all the planets rotate in the same direction as that in which they revolve.
Necessarily, too, the planet so formed not only would revolve in its orbit from west to east in the same direction in which the sun was revolving on its axis, but would also rotateor spin on its axis in the same direction.
But while all this planet forming was going on, the separate planets also continued to shrink, and, therefore, began to rotate more rapidly on their axes.
Every high tide, therefore, tends to make the earth rotate more slowly, and thus to slowly increase the length of the day.
From almost rotateto narrowly funnel-form; five-lobed; with ten vertical plates or scales at the base within.
The motor tends to rotate so fast as to produce a reverse voltage nearly equal to that supplied to the brushes; hence, the speed varies with the voltage supplied.
It is evident that unless suitable means were provided to reverse the polarity of the armature core at the instant it reached the position of the magnetic equilibrium, the armature would not rotate any further.
In the case of either a motor, or a dynamo used as a motor, the direction in which the armature will rotate is easily found by the left hand rule, as illustrated in fig.
Since the rod is at rest, the tendency to rotate to the right and left must be equal.
Hence a force that tends to turn or rotate a body to the right can be balanced by another of equal moment that acts toward the left.
The peripheric spheres rotate around the central, the images of the primary centre.
The planetary foetuses are only solar rings, which rotate with the sun.
The total weight of the revolving part of the light amounts to 7 tons, while the motive clock weight required to rotate this large mass at a speed of two complete revolutions a minute is only 8 cwt.
In cases where neither the mushroom trumpet nor the twin siren is used the single bent trumpet is arranged to rotate through a considerable angle.
The pulleys in this case rotate in the same direction.
Occasionally it may rotate the other way, and pass into the hollow of the sacrum, while the occiput comes in front, but this is very rare.
Precisely the same movements are gone through in this position as in the other, excepting that the head has to rotate considerably further.
The delivery is precisely the same in all the other positions of the face, excepting that in some of them the chin has further to rotate before it can pass under the pubes.
The Sacrum being behind however, has torotate much further to come in front, precisely the same as with the head when in the posterior position.
Then the surface of the frozen little world seemed to rotate swiftly and a dome appeared.
A splash of intensely glowing light rested over them, then began to rotate slowly as a motor somewhere hummed softly, cutting through the mad roar and rumble of power that surged through the laboratory.
Four hemispherical cups A are mounted on four radiating arms B, which are secured to a vertical stem C, and adapted to rotate in suitable bearings in a case, which, for convenience in explaining, is not shown.
If it is set so the axis is horizontal the wheel B will rotate on a vertical plane, and it forcibly objects to any attempt to make it turn except in the direction indicated by the curved arrows F.
In using the circle-pencil and circle-pen it will be found more convenient to rotate it in the direction of the arrow in Figure 34.
If grasped at C, the point, D, will rotate in the direction of F and will trail harmlessly.
