2020-05-11
220
Active Vocabulary
to deflect отклоняться
to emit излучать
to impact сталкивать(ся), ударять(ся)
to reproduce воспроизводить
to strike(struck) ударять, бить
emission излучение, эмиссия
emitter излучатель
striking velocity скорость при ударе
emitted wave излученная волна
deflecting voltage отклоняющее напряжение
impact test испытание на удар
degree степень, градус
envelope оболочка
face зд. поверхность
grid сетка
I. Read and translate the text
The picture-reproducing device
The picture-reproducing device is a cathode-ray tube, similar to the or- cathode-ray tube used in oscilloscopes. The cathode-ray tube may be called a picture tube, because the pictures are reproduced on the face of this tube.
The tube consists of a glass envelope, a source of electrons, which are formed into a beam, a control grid for varying the intensity of the electron beam, deflection system for deflecting the beam, and a screen. The screen is covered with a fluorescent material that emits light upon impact by the electron beam. The fundamental action of the cathode-ray tube in reproducing a picture consists in the electron beam's moving horizontally and vertically simultaneously so as to cover the whole area of the picture-tube screen. The control grid of the picture tube controls the intensity of the beam, which strikes the screen in the same way as the control grid of an amplifier tube controls the plate current. In this way, each portion of the picture tube has the proper degree of light or shade to reproduce the original image.
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Answer the following questions:
1. Why may the cathode-ray tube be called a picture tube?
2. What are the main parts of the cathode tube?
II. Read and translate the text
