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One versed in physics.

Radiations first observed by the French physicist Henri Becquerel, in working with uranium and its compounds. They consist of a mixture of alpha, beta, and gamma rays.

trum, so called because first accurately observed and interpreted by Fraunhofer, a German physicist.

rom the name of a noted maker in germany. It is called also Plücker tube, from the German physicist who devised it.

Of or pert. to the German physicist Heinrich Hertz.

in contact so as to exhibit the insulating effects of a vacuum. It was used by the German physicist W. Hittorf (b. 1824).

ll give a pound a velocity of one foot per second; -- proposed by J.D.Everett, an English physicist.

rays are similar in all their known properties to cathode rays. So called from the German physicist Philipp Lenard (b. 1862), who first described them.

A system or wireless telegraphy developed by G. Marconi, an Italian physicist, in which Hertzian waves are used in transmission and a coherer is used as the receiving instrument.

Of or pertaining to the German physicist Wilhelm Konrad Röntgen, or the rays discovered by him; as, Röntgen apparatus.

A believer in the theory of vitalism; -- opposed to physicist.

diations emanate in a strong magnetic field, first observed in 1896 by P. Zeeman, a Dutch physicist, and regarded as an important confirmation of the electromagnetic theory of light.