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Next, the surface, continually changing as it rotates, throws back a different light, and thirdly, the oaks' yellow-green high up, the pale ash, the tender ferns drooping over low down confer their tints on the stream. So from the floor of the pool, from the surface, and from the adjacent bank, three sets of colours mingle.
The air moves along with the earth as a part of it, and consequently no such frictional destruction takes place, but the earth rotates in the ether with that same rate, and if the ether offered resistance it would react so as to retard the rotation and increase the length of the day.
So far in dealing with all the planets and moons in the solar system we have made no remark on the way they rotate or revolve, because they all go in the same direction, and that direction is called counter-clockwise, which means that if you stand facing a clock and turn your hand slowly round the opposite direction to that in which the hands go, you will be turning it in the same way that the earth rotates on its axis and revolves in its orbit.
This simple apparatus enables us to illustrate another law of great practical importance, namely, that when a mirror rotates, the angular velocity of a beam reflected from it is twice that of the reflecting mirror. A simple experiment will make this plain. In every case the reflected beam moves through twice the angle passed over by the mirror.
"Venus is made still more difficult of habitation by the fact that she rotates on her axis in the same time that she revolves about the sun, in the same way that the moon does about the earth, so that one side must be perpetually frozen while the other is parched. "In Uranus we see the axis tilted still further, so that the arctic circle descends to the equator.
The large arrows show the direction in which the planet travels in its revolution about the sun, and the small curved arrows the direction in which it rotates on its axis.
The swift changing of place among the satellites, as well as the rapidity of Jupiter's axial rotation, give the attraction of visible movement to the Jovian spectacle. The planet rotates in four or five minutes less than ten hours in other words, it makes two turns and four tenths of a third turn while the earth is rolling once upon its axis.
As the loom beam rotates, the threads are arranged in layers between the flanges of the loom beam.
In spinning the orange you are turning it as the earth turns day by day, or, as astronomers express it, as it rotates on its axis.
What I wish to show you is that this motor rotates with one single connection between it and the generator; that is to say, one terminal of the motor is connected to one terminal of the generator in this case the secondary of a high-tension induction coil the other terminals of motor and generator being insulated in space. The experimenter's body is more than sufficient.
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