Cambridge's "hell horns," which have been silent since last month's blackout, will wail again at an unannounced hour this Sunday afternoon in an experiment to determine warden and public reaction to the air raid sirens.
In the past, Army and civilian defense officials have feared that use of the sirens would cause the public unnecessary alarm at first, while their continued use would cause indifference leading eventually to failure to heed the warning in the event of a real raid.
The test on Sunday is, therefore, intended to determine if people are capable of making the distinction between the test signal and the real signal without becoming panicky and without disturbing the air raid workers' practice. Consequently, Sunday's warning will consist of a series of three short blasts repeated for two minutes as contrasted with a series of five blasts, which would signify an actual raid.
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