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The tower's only weakness was in its lack of protection against a deliberate rocking motion. If I was able to swing it back and forth fast enough by slowly gaining speed and multiplying the momentum, it would be possible to get it to lean far enough that the dome would snap off, leaving the room open to the air. This was possible, though rather unlikely. But I tried anyway.

If, therefore, the departure of Jupiter from the sun had been the consequence of tidal evolution, it would follow that Jupiter must once have contained many thousands of times the moment of momentum that he has at present.

I. Of animal motions and of ideas. II. The fibrous structure of the retina. III. The activity of the retina in vision. 1. Rays of light have no momentum. 2. Objects long viewed become fainter. 3. Spectra of black objects become luminous. 4. Varying spectra from gyration. 5. From long inspection of various colours. IV. Motions of the organs of sense constitute ideas. 1.

Wrapped around the thorny top by the momentum of the cast, it hung, hissing and rattling with pain and hatred. The prospector looked up at the impaled rattlesnake with a smile. Reminiscences of Sunday-school flashed across his mind. "Gee, I'm a regular Moses," he ejaculated. "First I bring water from the face of the rock, and then I lift up the serpent in the wilderness.

When the piston is travelling in one direction the weights are travelling in the opposite; and the momentum of the piston and its attachments, which is arrested at each reciprocation, is just balanced by the equal and opposite momentum of the weights.

The distance was precisely what it should have been, and, as he threw out his hands, he struck the Indian squarely in the back with the whole momentum of the body. In fact, the daring boy nearly overdid the matter. He not only came near driving the Apache to the other side of the opening, but he came equally near plunging himself down it.

These rules provide the methods for estimating all the moments of momentum, so far as the revolutions in our system are concerned. For the rotations somewhat more elaborate processes are required. Let us think of a sphere rotating round a fixed axis. Every particle of that sphere will of course describe a circle around the axis, and all these circles will lie in parallel planes.

Its weight began to tell; it gathered momentum; it pushed ahead of its blunt nose a foaming white wave; it shot out of sight grandly, careening from side to side. The men cheered. "Well, we're off!" said Bob cheerfully. "Yes, we're off, thank God!" replied Welton. From that moment the affairs of the new enterprise went as well as could be expected.

And then he saw the monoplane on Blackheath was running down its guides to launch. It lifted clean and rose. It shot up into the air, driving straight southward and away from him. In an instant it came to him what this meant. It must needs be Ostrog in flight. He shouted and dropped towards it. He had the momentum of his elevation and fell slanting down the air and very swiftly.

In effect Washington had uttered those same words half a century earlier when he gave momentum to an era filled with energetic but unsuccessful efforts to join with the waters of the West the rivers reaching inland from the Atlantic.