Cathode rays


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Cathode rays

The name given to the electrons originating at the cathodes of gaseous discharge devices. The term has now been extended to include low-pressure devices such as cathode-ray tubes. Furthermore, cathode rays are now used to designate electron beams originating from thermionic cathodes, whereas the term was formerly applied only to cold-cathode devices.

References in periodicals archive ?
But then Crookes showed that a magnet would cause cathode rays to curve in their path, and from the manner of curving, it seemed quite certain that they carried a negative electric charge.
He placed certain chemicals, known to fluoresce easily, inside a cathode ray tube, surrounded it by dark paper, and darkened the room to observe the pale fluorescence that would result.
Hertz, the discoverer of radio waves (see 1888), had found that cathode rays could pass through thin sheets of metal, and this seemed to favor their being a wave form.
From the amount of the deflection, Thomson could work out the ratio of the electric charge of the cathode ray particle to its mass.
As physicists began to study the speeding electrons involved in cathode rays, and in other phenomena, however, it turned out that electrons might be moving at respectable fractions of the speed of light-up to 90 percent in some cases.