the study and use of the physical and optical properties of beams of electrons under the influence of electric or magnetic fields.
[ 1915-20 ]
the study and use of the physical and optical properties of beams of electrons under the influence of electric or magnetic fields.
[ 1915-20 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012