Man's physical universe

xanabras

ELECTRICAL CONDUCTION IN GASES 549

These rays were unlike any previously studied, and their

relation

to cathode rays was for some time unknown, so they were called X rays,

X standing for the unknown.

Fig. 272. X-ray radiograph of a man shaving himself, taken with an exposure

of 1/1,000,000 second. (Courtesy of the Westinghouse Electric and Manufacturing

Company.)

Early X-ray tubes were devised by Sir Herbert Jackson, of King's

College, London, who refused to patent them and thus permitted a

fortune to slip through his hands for the sake of Science. Such sacrifice

of personal benefit to the development of Science is not uncommon;

true scientists are more interested in the development of knowledge

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