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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.

It is easy to rotate the centrifugal machine by a belt from the mill, but better by a small engine attached, the power for which can be conducted by a small steam-pipe, and the distillation of the bisulphide can also be conducted without danger by the use of steam, as its boiling point is a very low one.

The agitation of water by paddles moving through it warms the water, and the accession of heat thus acquired measures the energy which has been expended in making the paddles rotate. The motion of a liquid of which the particles move among each other with friction, can only be sustained by the incessant degradation of energy from the mechanical form into the lower form of diffused heat.

Then one hundred and fifty years later this jest of Dean Swift's came true, for two moons were really discovered revolving round Mars, and one of them does actually take less time to complete its orbit than the planet does to rotate namely, a little more than seven hours! So the absurdity in 'Gulliver's Travels' was a kind of prophecy!

I have here a little light fan of aluminium sheet, fastened to a needle and arranged to rotate freely in a metal piece screwed to one of the terminals of the coil. When the coil is set to work, the molecules of the air are rhythmically attracted and repelled.

The voice rose to a higher pitch than usual, and assumed a tremolo. Then, if the other person was also endowed with sensibility, he or she would rotate and quake in somewhat the same manner. Their cups of tea would be considerably agitated. They would move about in as unnatural a manner as possible; and when they left the room, they would do so with gaspings and much waste of breath.

Netlips with a gracious bend of his fat neck "And it is not to be regretted by the profane that you should rotate with the world, provided you are seen in strict adhesion to the pulpit on the acceptable seventh day. Otherwise, it is but natural that you should preamble for health's sake. You have been looking poorly, Mr. Walden sir, of late; I trust you will beneficially profit by change."

"Yes: I have rotated the gone-to-seed lettuce off, and expect to rotate the turnips in; it is a political fashion." "Is n't it a shame that the tomatoes are all getting ripe at once? What a lot of squashes! I wish we had an oyster-bed. Do you want me to help you any more than I am helping?" "No, I thank you." "Don't you think we could sell some strawberries next year?"

A small tube conveys ink from a reservoir along one of the pen-arms, and into a glass tube upright at the junction of the arms. This tube is the pen. Now, let us imagine the pencil of the writer pushed straight upward from the apex of the V-shaped figure the cords and pencil-point make on the writing desk. In the latter, in ordinary use, the stick and string; rotate the spool.

Now, as Mars takes more than twenty-four hours to rotate, this was considered ridiculous, for no moon known then took less time to go round its primary world than the primary world took to turn on its own axis. Our own moon, of course, takes thirty times as long that is a month contains thirty days.