I'm going to guess it's a 20. Working with perspective and depth of field, I can determine that the siren has the same horizontal dimensions as a Model 5, but is much taller (nearly as tall as the Chevy pickup).
Any siren anywhere near a playground is a bad idea, particularly if it's mounted ON the playground (like the Model 5 in the Lowest Sirens thread). All the little children could get their hearing permanently damaged during testing (who would be out there during a tornado?).
Luv the British tone! whoever last serviced that motor knew exactly what tone they wanted out of it, and how to set the brushes to achieve it... More like whoever last serviced that motor (whenever that was) didn't know how to set the brushes. Considering the Downtown 3T22 was taken down when they ...
This siren makes me curious as to why it's 4/5 as opposed to the usual 5/6. Perhaps it was one of Federal's experiments? Perhaps it was the first 1003 to exist (unlikely, but possible)?
No i meant replace the 9/12 rotor and stator in an SD-10 with the 12 port rotor and stator of a 2T22, creating a 12 port single tone SD-10. You'd need a Model 5. The rotor of an SD-10 is roughly 17.5 inches in diameter (as is that of a model 5), while the rotors of a 2T22 are roughly 12.5 inches in...
Over the course of the test, the pitch drops about a half step (one musical note value lower)... I wonder why that happens. I recorded a Model 2 once whose pitch dropped by one-and-a-half steps through the duration of the test (three musical note values lower).