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280 U. S. GOVERNMENT FILMS bitry or full-time operator. (50 frames: double) 39 Radio and Control U.S. Department of the Navy, 1942. How aircraft radio is used in maintaining contact with base stations. (SN 812; 55 frames) 7 Radio Bearings U.S. Department of the Air Force [1943?]. (Aerial Navigation Series. Ra- dio Navigation No. 3) Definition of true, relative and reciprocal bearings; how to take and use radio bearings to obtain a fix; plotting radio bearings on the Mer- cator and DF chart. (FS 1-270; 42 frames) 7 Radio Direction Finder U.S. Coast Guard, 1943. (Piloting Series) Construction and operation of Radio Di- rection Finder, models RDSC-121, DAE, andCGR-17. (56 frames) 41 Radio Frequency Amplification U.S. Department of the Navy, 1942. Theory and practice of amplification of the detected radio wave. (SN 653, 18 frames) 41 Radio Navigation. Part 1: The Radio Range U.S. Department of the Navy, 1944. (In- strument Flight Control Series) Direc- tional receiving antenna and loops used in radio navigation. Revision of "Radio Navigation. Part 1: Radio Range Fly- ing," also available. (SN 1059-x; 64 frames, synchronized disc, 25 minutes) 41 Radio Navigation. Part 1: Radio Range Flying U.S. Department of the Navy, 1943. (In- strument Flight Control Series) Low frequency radio range characteristics; how its courses are produced; signals heard in each quadrant, along each course; variation in intensity with air- craft direction and position; fan markers used. Revision, "Radio Navigation. Part 1: The Radio Range," also available. (SN 1059-g; 57 frames, synchronized disc, 25 minutes) 41 Radio Navigation. Part 2: Bracket- ing U.S. Department of the Navy, 1943. (In- strument Flight Control Series) How to bracket a course of a low frequency ra- dio range. (SN 1059-h; 38 frames, syn- chronized disc, 20 minutes) 41 Radio Navigation. Part 3 U.S. Department of the Navy, 1943. (In- strument Flight Control Series) Title self-explanatory. (SN 1059-4; [50?] frames, synchronized disc, [20?] min- utes) 41 Radio Navigation. Pan 4: Irregulari- ties in Radio Range Operation U.S. Department of the Navy, 1943. (In- strument Flight Control Series) Causes of irregularities of L.F. radio range op- eration; instrument approach procedures. (SN 1059-j; 41 frames, synchronized disc, 20 minutes) 41 Radio Navigation. Part 5 U.S. Department of the Navy, 1944. (In- strument Flight Control Series) Princi- ples of operation and uses of radio di- rection finder. (SN 1059-k; 93 frames, synchronized disc, 25 minutes) 41 Radio Navigation. Part 6 U.S. Department of the Navy, 1944. (In- strument Flight Control Series) Various systems for taking a fix using radio di- rection finder: radio station, 45°, doubl- ing the angle off the bow QDM, and box. (SN 1059-1; 55 frames, synchro- nized disc, 22 minutes) 41 Radio Range Course Control Ele- ments U.S. Department of the Air Force, 1943. Components and construction of inter-