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 ?
In 1895, however, a French physicist, Jean-Baptiste Perrin (1870-1942), showed that when cathode rays were made to impinge upon a cylinder, the cylinder gradually gained a large negative charge.
In 1880, using his own Crookes tube, he showed that cathode rays traveled in straight lines and cast sharp shadows.
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.