Shipping | 1950 | Sound | B/W
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An instructional film produced for the Admiralty on the subject of radar. Very technical with lots of diagrams.
Diagram explaining how a radar works, reflection of radio signals. Focus on the cathode ray tube. Spot of light in cathode ray tube forms trace. The plan position indicator (PPI). The radar screen in which a line of light revolves. Explanation of how the Cathode Ray Tube (CRT) and the PPI produce the spot of light on the screen. Diagrammatic explanation: anodes, cathodes, fluorescent material, on inner part of screen. The concept of an Electron Gun, an Electrostatic Tube. Demonstration of the focus control. Movement of the light on the screen by use of 'x' and 'y' plates. Diagram of how the cathode ray tube is linked up to the radar transmitter. The PPI: also uses an electromagnetic tube. Again, explains how focus works and how the dot is made to revolve on the screen. Examples of a PPI working. Different types of radars at work.
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