Jack Campbell opens the flap of the Chrysler Air Raid Siren. Photo caption reads: "This 5400-pound monster is one of three new type air raid sirens which will be tested at noon next Monday, the Office of Civil Defense announced today. Examining it is Jack Campbell, superintendent of the Federal Building, where it is now located. The siren has a range of from three to five miles. Current sirens have a range of about one mile. The two other sirens to be tested are near the Griffith Park Planetarium and above Avenue 43 in Highland Park". Photo dated: January 22, 1954.
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