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Updated: May 21, 2025
Some of the machines which perform the winding-on of the yarn are comparatively simple, while others are more or less complicated. In some the loom beam rotates at a fixed number of revolutions per minute, while in others the beam rotates at a gradually decreasing number of revolutions per minute.
As the mill rotates, the heck with the threads descends gradually and thus the group of threads is disposed spirally on the vertical spokes of the mill until the desired length of the warp is reached. A beamer's lease or "pin lease" is now made on the two lower pegs; there may be two, three, four or more threads in each group of the pin lease; a common number is 7 to 9.
But the sun's radius is about 111 times that of the earth, and if the period of rotation were the same, the centrifugal force at the sun's equator would be greater than that at the earth's in the ratio of ^2 to 1, or, more exactly, in the ratio of 12,342.27 to 1. But the sun rotates on its axis much slower than the earth, requiring more than 25 days for one revolution.
Like Jupiter, it rotates very rapidly on its axis, the period being ten hours and fourteen minutes. Not including the rings in the calculation, Saturn exceeds the earth in size 760 times.
A standard English target arrow rotates during flight six complete revolutions every twenty yards, or approximately fifteen times a second. Heavy hunting shafts turn more slowly. This was ascertained by shooting two arrows at once from the same bow, their shafts being connected by a silk thread, so that one paid off as the other wound up the thread.
But one is aware that the molecules of a conductor are practically in contact with each other, and that if one for any reason rotates, the next one to it would, from frictional action, cause the one it touched to rotate in the opposite direction, whereas, the evidence goes to show that all rotation is in the same direction. How can this be explained mechanically?
The size and position of the two recently discovered satellites of Mars, which are believed to be not more than ten miles in diameter, the more remote revolving around its primary very little slower than the planet rotates, while the nearer one, which is considerably less distant from the planet's surface than its own antipodes and revolves around it more than three times during the Martian day, may perhaps be looked upon as the remnants of the great meteor-swarm which completed the Martian development, and which are perhaps themselves destined at some distant period to fall into the planet.
"Time, replied the spirit, "has not the same significance to us that it has to you. You know that while the earth rotates in twenty-four hours, this planet takes but about ten; and the sun turns on its own axis but once in a terrestrial month; while the years of the planets vary from less than three months for Mercury to Neptune's one hundred and sixty-four years.
For, as the reflecting reader need hardly be reminded, since she rotates with perfect regularity on her axis, she can make such rotations visible to the Selenites by bringing some particular point on her surface once every twenty-four hours directly over the same lunar meridian. Towards the Moon, the view though far less distinct, was still almost as dazzling as ever.
Then they again attracted the nearest moon beyond which they had swung, increased the repulsion on Jupiter, and soared away towards Saturn. "We have a striking illustration of Jupiter's enormous mass," said Cortlandt, as the apparent diameter of the mighty planet rapidly decreased, "in the fact that notwithstanding its numerous moons, it still rotates so rapidly.
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