. Elementary and dental radiography / by Howard Riley Raper . 95. Roentgen applied the name X-rays because he did not knowjust what he had discovered; X, the algebraic symbol for the unknown,being adopted to signify this ignorance. They were not called X-raysbecause the rays cross, forming an X, as is popularly supposed. The Roentgen Congress, in Berlin, 1905, adopted a uniform set oftechnical terms in which the word Roentgen always occurred. Thus wehave the phrase Roentgen ray for X-ray and such words as Roentgen-ology, Roentgenologists, Roentgenogram, etc., etc. While approving ofa move for
. Elementary and dental radiography / by Howard Riley Raper . 95. Roentgen applied the name X-rays because he did not knowjust what he had discovered; X, the algebraic symbol for the unknown,being adopted to signify this ignorance. They were not called X-raysbecause the rays cross, forming an X, as is popularly supposed. The Roentgen Congress, in Berlin, 1905, adopted a uniform set oftechnical terms in which the word Roentgen always occurred. Thus wehave the phrase Roentgen ray for X-ray and such words as Roentgen-ology, Roentgenologists, Roentgenogram, etc., etc. While approving ofa move for a uniform nomenclature, many of the new words are longand unwieldy and the writer shall, in this work, use many of the old andbetter-known terms. X-rays are invisible, vibratory waves of or in the ether. The most AL SCHOOL 50 ELEMENTARY RADIOGRAPHY popular theory is that they are light waves with an inconceivably rapidrate of vibration. Red light rays vibrate at the rate of four hundredbillion per second; violet rays vibrate at the rate of seven hundred and. Fig. 4 7. X-ray tube properly lit up.
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