![]() At the same time you connect the filament and the fluorescent screen together with an electrical source. You pass an electrical current through the filament and it starts to glow. At the other end is fluorescent screen which is just like an old fashioned TV screen. Inside at one end is an electrical filament (which is actually called the cathode in this experiment) just like the one inside a light bulb. Coolidge in the X-ray tube and now known to all as an essential part of radio tubes, furnishes the supply of electrons.His experiments were all conducted with what is known as a cathode ray tube, so firstly I will try to explain what this is and how it works.Ī cathode ray tube is a hollow sealed glass tube which is under vacuum (has had all the air sucked out of it). A heated tungsten filament, originally used by Dr. There is a “window” three inches in diameter, of nickel foil the thickness of which is measured in thousandths of an inch and which is capable of withstanding a total atmospheric pressure of more than a hundred pounds. Several unusual features have been incorporated in the new tube. Improvements have been numerous since then, but with previous tubes the metal "windows" were much smaller and the operating voltages much lower than with the new tube. At first, however, thev were known only within vacuum tubes, but about thirty years ago a European scientist, Lenard, succeeded in making the electrons pass through a tiny piece of extremely thin aluminum foil cemented to the glass wall of the tube. Crystals of the mineral calcite apparently become red hot coals when exposed for a moment to the rays, but they are glowing with cold light ordinary salt is turned brown, and considerable time elapses before it again becomes the colorless substance it usually is bacteria and small flies are almost instantly killed by exposure to the rays ordinarily colorless acetylene gas is transformed into a yellow solid which cannot be dissolved and a rabbit's gray hair has been destroyed, to be replaced later by a profuse growth of longer, snow-white hair.Ĭathode rays have been known to some extent for many years. So much more concentrated are the rays from the tube that many startling experiments have been conducted with the new device. The electrons given off by radium are of higher average velocity than those so far produced with the cathode ray tube, but otherwise the two are alike. The cathode ray tube likewise bombards high speed electrons into space, but at a rate that can be controlled by man, and in quantities far greater than by all the radium in the world. The rate at which radium disintegrates is beyond human control nothing that man can do seems to affect the rate at which the element breaks down. Radium is constantly disintegrating, and in so doing is bombarding electrons-infinitely small particles of matter or electricity-into space at very high velocities. Potts gold medal of the Institute for his outstanding work in the development of X-ray tubes. ![]() ![]() Coolidge of the Research Laboratory of the General Electric Company at a meeting of the Franklin Institute of Philadelphia, on the occasion of the award to him of the Howard N. ![]() A vacuum tube which produces as many electrons per second as a ton of radium- and there is only a pound of that rare substance in the world-was announced by Dr.
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