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...both types of photoluminescence are similar physical phenomena. Many luminescent materials are crystalline. Impact of light waves moves some electrons away from their normal position within the latticed clumps of molecules called phosphors. Then, as each electron moves back to its original orbit, it emits light waves. Length of afterglow depends upon the time taken by the electrons in returning...

Author: /time Magazine | Title: Science: Blackout Glow | 1/19/1942 | See Source »

Bugs. Men who have spent their lives studying insects got a thrill from their first really close-up view of the delicate anatomy of these tiny creatures. Magnified up to 20,000 diameters (ten times larger than light-microscopes can do) by R.C.A.'s new electron microscope (TIME, Oct. 28, 1940), insect innards were revealed in photographs exhibited at the A.A.A.S. meeting by Zoologist Albert Glenn Richards Jr. of the University of Pennsylvania, and R.C.A.'s Thomas F. Anderson. Bugmen buzzed with delight at the spectacle of mosquitoes' windpipes, a butterfly's scale, a roach...

Author: /time Magazine | Title: Science: Evolution by Cooperation | 1/12/1942 | See Source »

...electron-hurling machine, weightiest contribution to atomic physics since the cyclotron was invented in 1931, was unveiled before science and the world last week. It can hurl electrons-particles of negative electricity-at nearly the speed of light. It can produce 20,000,000-volt X-rays, some ten times more than the world's biggest X-ray machine. It can out-radiate all the extracted radium supplies on earth-and its further abilities have scarcely been explored. While U.S. scientists speculated upon the discoveries the device might lead to, they welcomed to their front ranks its brilliant young...

Author: /time Magazine | Title: Science: Cyclotron's Rival | 12/29/1941 | See Source »

...heart of the betatron," explains Inventor Kerst, "is a doughnut-shaped glass vacuum tube between the poles of a large electromagnet" (see cut). Inside the tube, a hot filament gives off electrons. Magnetically guided, each electron circles about the tube 400,000 times, accelerated at each rotation by small 70-volt kicks whose cumulative push gives the particle an energy of 20,000,000 volts within a fraction of a second. These fiercely energized electrons are then either: 1) Released continuously from the tube as a beam of beta rays-whence the betatron's name-which...

Author: /time Magazine | Title: Science: Cyclotron's Rival | 12/29/1941 | See Source »

This week, while G.E. is starting work on a giant 100,000,000-volt model, Kerst is shipping his betatron to his laboratory in Illinois to see what discoveries he can make with it. Its electron beams have already penetrated inch-thick aluminum, made copper radioactive. Its medical applications, like those of the cyclotron which once struck the bewildered public as a useless device, must be explored. In time the betatron may be able to produce earthborn artificial cosmic rays, whose fantastic energies - hundreds of millions of volts - now smite the earth mysteriously from among the stars...

Author: /time Magazine | Title: Science: Cyclotron's Rival | 12/29/1941 | See Source »

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