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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 |
Figures 18,
19 and 20
DIAGRAM OF PULSE SYSTEM OF RADIO DETECTION
These diagrams have been reproduced directly from the Annual Report
of the Signal Corps Laboratories for Fiscal Year 1937 on Means of Detecting
the Approach of Aircraft and Marine Surface Craft Beyond Visual Range.
They demonstrate that the laboratories at that time used the essential
principle of modern equipment.
SCL Annual Report FY 1937, figs. 4, 5 and 6
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