Some_3t22s wrote: ↑Wed Feb 10, 2021 12:46 am
Synther wrote: ↑Tue Feb 09, 2021 11:27 pm
Air powered B&M.
How does that work exactly? I'm assuming something in that rear part has to do with it where something like a fan's spun by air.
Instead of an electric motor a stream of pressurized air turns a turbine which turns a siren. It was controlled by a solenoid controlled most likely by a radio receiver or telephone activated relay. The air probably came from the Santa Fe shops mentioned in the photo. Railroad shops use air to drive impact wrenches (NASCAR tire changer style), rotary cutters, and other tools as well as charge train air brakes. This was known as "Yard air".
I know Sirenco still makes an air powered siren today. One advantage of air powered sirens is they are EMP proof and blackout resistant.(As long as you have air and a valve to manually control them).
21 Y.O. Student welder.
"This is my step van. I never knew my real van."