Background of Large Area Screening

Background of Large Area Screening Experiment and Trial 

Canal were unsuccessful, the search for agents and means of disseminating area screens continued sporadically until 1936 when the War Department decided that with the means available large area screening was not practicable/ 

At that time, the war in Europe provided actual combat tests of the use of smoke. Before mid-1940 British interest in large area screening had been rather theoretical—an interesting proposition but hardly practicable. When the German invasion of the Low Countries and 

Mo Phosphorus, chlorosulfonic acid, and hexachlorethane (HC) had been the agents tested. (2) For a review of large area smoke tests at Panama from 1921 to 1939, see OCCVS Tech Study 23, Use of Smoke to Screen Panama Canal Locks, iS Jul 40 (rewritten 9 Jul 41). (3) Special Folder on 

Beginnings of Large Area Screening in the United States 

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