This is more typical for a Japanese motor siren.



https://www.youtube.com/watch?v=j10La7B2EGY

Possibly a Hedberg model. They came in several shapes.

Sounds a bit like the fire horns in my home town. When Thunderbolts were being sold, Ukraine was still part of the Soviet Union, and they would not have invested in an American-made siren system any more than an American town would have purchased a Russian-made S-40 siren.

Just a note for anyone with $1,800 to spare - a 1913 Heath Siren is on eBay, number 323265506059

(Not my sale).

I would just replace the reflector disc and it’s mechanism with an omnidirectional cone.

The last time I drove through Stevenson, the horn was facing in a different direction. I don’t know of any other Thunderbolts in the Gorge, but on the Washington side are several sirens, including a 2T22 in Carson, two STH-10s in North Bonneville, 2 Model 5’s in White Salmon, Model 2’s in Bingen, Pa...

By the 1980’s, those units were gone from public schools in Oregon, but most schools still had Model A-sized sirens in the hallways that were used as fire alarms.

Fast wail was invented for the 2001 series and, as far as I know, not a feature of the AR/AF series. Many older sirens cannot react fast enough for fast wail to make a distinct signal.

The fire signal on most AF timers was five cycles of attack, but could be ordered in other configurations. I configured mine to sound three cycles of 12 seconds on and 8 seconds off. What’s interesting is that the fire signal has a separate output from the attack and alert signals, so a different si...