I found the photo credit for the photo on crazywarriorman's photobucket page.
http://s642.photobucket.com/albums/uu14 ... 00056A.jpg
This siren was installed on the water tower on top of the L. S. Ayers building in Indianapolis.
The Associated Press credit reads:
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SUPER AIR RAID SIREN INSTALLED
Workers complete installing this 50-Horsepower super air raid siren atop the L.S. Ayers building in the heart of Indianapolis. Said to be the world's largest electrically driven siren, it weighs 900 pounds and sits 170 feet above street level and can be heard for a mile. It will have it's first public test on March 31 when Indianapolis stages it's first alert since World War II.
Associated Press Photo
GBF-3/27/52-STAR
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I'll prepare a composite picture of the photo and the credit next week and post it.
Raymond D. Woods, Jr.
Owner of a Federal Signal Thunderbolt 1000T air raid siren. :TBolt: