United States USA Date:1945 Duration:4 min 13 sec Sound:Yes
Animation depicts various means of detecting sneak attack craft and protecting harbors. It illustrates ways of detecting a sneak torpedo through means like multi terrain loop and short pulse herald. A man in a control room speaks on a phone. A human torpedo underwater. A torpedo dives under the water. Detection device used to detect the presence of torpedoes in water. A technician works on the control panel of the detection device. A graph being printed. Short pulse herald technique being used to to detect torpedoes underwater. A radar detects the presence of torpedoes in sea. A torpedo underway on the surface and underwater. Effectiveness of torpedo nets.
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