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Title:SPOTTING FALL OF SHOT WITH RADAR 931 [Allocated Title]
Film Number:ADM 191
Summary: Naval Instructional Film.
Description: The commentator emphasises the complexity of modern naval warfare, and the need for a quick reaction to contact with the enemy. Vital rôle of gunnery fire control radar which provides range, rate of change of range, and bearing of a target. Visual spotting and gunnery control is sometimes difficult in darkness or bad weather, but shell splashes can be detected by radar. Radar 931 is the first set specially designed for this purpose, and is intended for use in battleships and cruisers. A description of the method of information presentation on the radar display screen is followed by a brief account of the physical characteristics of the set, and a schema of the general principles of operation. An animated sequence follows a single radar pulse through transmission, reflection and reception, and explains how the 'B' scope picture is built up. A description of the range and extent of the radar cover precedes film of field trials carried out at Lake Ontario using simulated 6-inch gun splashes. Radar pictures of the lake shore and a distant rainstorm are also shown. "All right, you know now what Radar 931 is, what the set does, and how it does it".
Remarks: At 747 ft on Reel One a fly can be seen settling on the 'B' scope.