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Title:RADAR PART 10 : the auto barrage unit [Main Title]
Film Number:ADM 2559
Summary: Barrage theory, and how the ABU ensures greater success in relation to the large quantities of ammunition expended.
Description: (Reel 1) Good opening shots of barrage fire from ships, with shells set to explode at a specific range, against attacking aircraft. Good gunnery scenes on 4 inch gun. Animations demonstrate barrage theory. Problem: uses too much ammunition. Radar can provide greater precision, allowing barrage fire at a specific target rather than as a deterrent. The ABU, used in conjunction with radar Types 283 and 285 (illustrated in use), fires the guns. How to adjust ABU. How a salvo is fired. (Reel 2) Recapitulation of procedure when ship comes under air attack. Ends with shot of blazing aircraft ricocheting along the water.