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by Andrew Lambert Photography
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Cathode ray tube. Image 1 of 2. Demonstration showing how a beam of electrons can be used to produce fluorescence on a phosphor-coated screen, as... more
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Cathode ray tube. Image 1 of 2. Demonstration showing how a beam of electrons can be used to produce fluorescence on a phosphor-coated screen, as seen in television cathode ray tube (CRT) displays. Here, electricity from the wires (left) is heating a cathode to produce a beam (blue) of electrons (also called a cathode ray), which is seen by the ionisation of the gas around it. The phosphor-coated area (round, at right) is glowing green as the electrons cause the phosphor to emit light. In a CRT display, the beam is moved using magnetic fields. Here, Helmholtz coils (round) surround the glass tube, and will provide the magnetic field. Here, the Helmholtz coils are not switched on. See image T540/149 for this electron beam deflected by a magnetic field.
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