From Wikipedia
The Federal Signal 3T22 and 2T22 are dual-tone, mechanical outdoor warning sirens made by Federal Signal Corporation (formerly Federal Sign and Signal Corporation) from 1952 through the early 1990s. Both have a very recognizable design, with a ten-port rotor (chopper) on the bottom with ten cones (horns) and a 12-port one on top with twelve cones.
Frequently asked questions
What does the Federal Signal 3T22/2T22 sound like?
Sources & credits
- Wikidata Q5439989 – CC0
- Wikipedia: Federal Signal 3T22/2T22 – CC BY-SA 4.0
- Image by JoJoes123 – CC BY-SA 3.0