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And now he turned the light of these discoveries upon the darkest physical phenomenon of that day. Arago had discovered, in 1824, that a disk of non-magnetic metal had the power of bringing a vibrating magnetic needle suspended over it rapidly to rest; and that on causing the disk to rotate the magnetic needle rotated along with it.
"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?"
It is well known to artillerists that a projectile of four or more calibers in length has to be rotated at a much higher speed than one of half that length, in order to keep the projectile stiff in the air, and to prevent it from ending over in its flight.
The globe tilted farther, swung around, then down; two chips fell out, clattered down a chute and into a box. "We're ahead," Magnan said. "Let's quit." Retief shook his head. The globe rotated, dipped again; three chips fell. "She's ready," someone called. "It's bound to hit soon," another voice added excitedly. "Come on, Mister!" "Slow down," Magnan said. "So it won't move past too quickly."
The impulse would have sent it off in a straight line, but the pull of gravity from the nebula held it in place, and it circled round; then the nebula, as it rotated, contracted a little, and occupied less space and grew denser, and presently a second piece was thrown off, to become in time another planet. The same process was repeated with Saturn, and then with the huge Jupiter.
A rotary spark gap comprises a wheel, driven by a small electric motor, with projecting plugs, or electrodes, on it and a pair of stationary plugs on each side of the wheel as shown at C. The number of sparks per second can be varied by changing the speed of the wheel and when it is rotated rapidly it sends out signals of a high pitch which are easy to read at the receiving end.
They would have gone ambling along such dreamland roads to the end of their vacation had it not been for the motor-car of Uncle Joe's son-in-law. That car changed their entire life. Among the hills of peace there was waiting for them an adventure. Uncle Joe's son-in-law lived in a portable bungalow a mile away. He rotated crops. He peddled fish with a motor-car.
Can you show me the best land and the poorest land on the estate?" "I think I can." said Mr. West. "We have some land that has not grown a crop in fifty years, and we have other land that still produces a very fair crop if properly rotated." "And what rotation do you practice?"
C shows the same bar with its molecules at zero, or transversal, the directing force of earth being insufficient without the aid of mechanical vibration to allow them to change. The dotted lines of D suppose the molecule to be in the center of its free motion, while at C the molecules have rotated to zero, as they are prevented from further rotation by being at the extreme end of its free motion.
As a radiation shield, it provided sufficient safety against cosmic radiations of space and from solar radiations, except for solar flare conditions, to provide a margin of safety for the crew over the three months in which they would do their jobs before being rotated back to Earth for the fifteen-month recovery period.
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