Order number 940406-17 page 53 801. set 5 wi KEYWORD (S) 1627-13 OFFICIAL USE ONLY precursor effects. The height-of-burst chart can be extended to yields of the order of 500 KT. Semiquantitative measurements of shock symmetry are described in Appendix A. KING BURST/blast measurements ;KING BURST/yield ; KING BURST/pressure-distance studies ;MIKE BURST/blast measurements ;MIKE BURST/yield ;MIKE BURST/pressure-distance studies ;HEIGHT OF BURST; IVY; YIELD; SCALING LAWS; DISTANCE; PRESSURE MEASUREMENT Item 92 150. 110. 70. 710. 371. 34. 950. REPORT NUMBER PRIMARY TITLE (M) PERSONAL AUTHOR( M) CORPORATE SOURCE PUB. DATE (YYMMDD ) CLASSIF. LEVEL T EXT ABSTRACT 801. KEYWORD (S) NAVORD-R--6156 Frequency-modulation magnetic-tape playback system Torpy, D.J. Naval Ordnance Lab., White Oak, MD (USA) 580801 Unclassified Data recording systems which make use of frequency-modulation of a carrier signal recorded on Magnetic tape are subject to noise resulting from speed variations in the recording or playback mechanisms. This report describes a playback system which reduces this noise by utilizing a constant-frequency signal recorded Simultaneously with the data signal, but on a different channel of the tape, to obtain a measure of the speed variations. By using this information, the system reduces the noise to a fixed level which is independent of the magnitude of the speed variations. This playback system was designed for use in connection with Hardtack Project 1.1 and was used in processing the magnetic tape information obtained in the field. 2 references. ATOMIC WEAPON TESTS/magnetic recording systems ; ATOMIC WEAPON TESTS/data processing ;NOISE;HARDTACK; INSTRUMENTATION Item 93 150. 110. REPORT NUMBER PRIMARY TITLE (M) WT--59 US Air Force structures. Appendix E. Blast loading and structural response. Section 1. General blast loading and response. Annex 3.3 [of] scientific director’s report of atomic weapon tests at Eniwetok, 70. 710. 371. 34. 1951. Operation Greenhouse PERSONAL AUTHOR ( M) CORPORATE SOURCE AFB, Pettitt, Air Force Air Materiel Command, OH (USA). Foundation, PUB. DATE (YYMMDD ) CLASSIF. LEVEL T EXT 90034821 B.E. 510300 Air Installations Div. Chicago, IL (USA) Official Use Only OFFICIAL USE ONLY - Wright-Patterson ;Armour Research