Word: electromagneticism
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A new electromagnetic launcher for earth and space
More than a century ago, visionaries like Jules Verne were suggesting a better way. A bullet-shaped vehicle, they claimed, could be propelled far faster by using powerful electromagnetic fields. Now, as a result of lab work in the U.S. and abroad, the Vernean scheme shows promise of becoming a...
Revival of serious interest in railguns began a few years ago, when Physicist-Engineer Richard Marshall and his colleagues at the Australian National University in Canberra updated the old concept with some notable innovations, including the plasma-creating fuse. They also increased the gun's muzzle velocity by resorting...
Ordinary light, whether from the sun or a 60-watt bulb, consists of a jumble of electromagnetic waves of different frequencies. But a laser-for light amplification by stimulated emission of radiation-generates a beam whose waves all have the same frequency and are perfectly synchronized so as to reinforce...
In most high-power lasers the beams emerge from tubes containing mixtures of gases that have been "pumped" by intense bursts of electricity or flashes of light. If the gas in the tube is a helium-neon mix, the laser produces a red beam; a mercury-bromine mix yields a...