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of U.S. ARMY RADAR EQUIPMENT PART 1 Early Research and Development - 1918 - 1937 by H. M. DAVIS,
CONFIDENTIAL
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national defense of the United states within the meaning of the Espionage Act, 50 17. S. C. , 31 and 32. as amended. The transmission or the revelation of its contents in any manner to an unauthorized person is prohibited by law. 
Copy No. 27of35copies made xiv plus 69pages and 31 illustrations Historical Section Field office Special Activities Branch Office Service Division Office of the Chief Signal officer Army Service Forces |
Figure 11
SOUND LOCATOR WITH CORRECTOR
This 1927-model sound locator was equipped with a corrector designed to compensate for the time lag resulting from the slow speed of sound arriving at the detector from the plane. All such correctors predict the course of the plane on the basis of its measured speed and angular velocities, beat cannot correct for evasive action by the pilot.
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