rays are streams of subatomic negatively-charged particles that we now call electrons . cathode rays are emanations from electrodes in vacuum tubes that travel the length of the tube to hit a phosphorous -coated screen and produce a luminous spot. cathoderaytubes are used in most ordinary televisions...
the royal society of edinburgh ( ) john logie baird frse ( /ˈloʊɡi bɛərd/ ; [ ] august – june ) was a scottish engineer, innovator, one of the inventors of the mechanical television , demonstrating the first working television system on january , and inventor of both the first publicly demonstrated colour...
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principles of the gauge, the range of pressures it can measure, and its accuracy over the required range. these factors have been determined by experience and there is a vacuum gauge for every pressure range. for low ("rough") vacuum ranges (higher pressures) between atmospheric and torr, bourdon tubes...
ray tube (class / ) inter-electrode connection (class / ) control electrode unit (class / ) with evacuating pump (class / ) arc and separate incandescent body (class / ) filament and separate incandescent body (class / ) with temperature indicator (class / ) with temperature modifier (class / ) spark...