I believe that the trumpet was mainly used to modify the sound at the intake as that was the case with most vehicular sirens of the era. The thing about the Sterling is that it is so rare. I have never even seen advertising on it, and I have access ti Fire Engineering magazines going back to the thi...

Franz, Greetings from one old fart to another. (70 years and counting). Although our interests are somewhat the same, sirens, they differ in that I am strictly into vehicular sirens. I am very familiar with the Sterling line, and coincidentally, the First Sterling model H was a hand cranked siren ca...