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Old 12-13-2017, 3:56 PM
radioman2001 radioman2001 is offline
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Not a thunderbolt, as thunderbolts required an air compressor (some were actually Chrysler Hemi engines) to amplify the sound through the rotating horn (I was a service tech for Federal Signal for a short time in the late 70's). Think of a normal size siren (Federal model 5) and multiply x4 that's how big around it was about 40 in and took 2 telephone poles to hold it.

Last edited by radioman2001; 12-13-2017 at 4:00 PM..
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