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Here are 22 photos of 22 sirens from my first trip over to Fort Worth to photograph their old civil defense siren system. There are more photos in this section on pages 2 and 3. There were 71 sirens in the old Fort Worth system. When I photographed these old sirens in 2005 only one had been removed to make way for one of the new sirens.
I never would have gone to the trouble to document these old sirens if they had been all of the same type of siren. There were five different types of sirens from two different manufacturers in the old Fort Worth siren system. The first batch of sirens Fort Worth installed was a system of Federal Thunderbolts, STH-10s and SD-10s. It's obvious looking at the installations of the Federals that these were done at the same time. I wish I had a date when they were installed but I would guesstimate that is must have been sometime in the mid-1950s or so. I believe all the old Thunderbolt sirens were 1000 single tone models.
The system was expanded with some ACA (Alerting Communicators of America now American Signal Corp.)
sirens later. I'm not sure of the date the ACA sirens were installed.
Maybe mid to late 1970s? The ACA additions are Allertors and Penetrators. I believe
the Penetrators are P-10s but I'm not sure. Some of the Penetrators are
light blue-gray in color. These look like they a probably newer sirens than the other ACA siren to me but again I'm
not sure of the age I'm just going by their appearance. Just taking a wild
guess I think the Allertors and yellow Penetrators are the same age and
the light blue-gray Penetrators are a bit newer.