Sun Oct 28, 2018 6:39 am
The recording of an 8-Port Mobil Directo is exist, but IIRC the only one is the one at Milwaukee, WI, a gas-powered variant which turned electric.
Anyhow, Dennis,
1. Assuming there's no Gas MD recording around, could we see a video of your museum unit running from start, engine running, signal then shutdown? Not rotating is the another thing. (Talking about rotating, the siren supposed to turn using only one engine / motor)
2. Instead of playing a recording through the horn, why not have the siren really sound using its chopper (The part you refer as "... cylinder spinning in another hollow cylinder with holes parallel to each other to create sound...")? That'll make more sense to visitors. Noise levels? A full demonstration outdoors and/or stuffing the air intake (Lower horn), projector horn (Upper horn) (But put fabric BEFORE the smaller end) and elbow with layers of black colour fabric could do it. Some Thunderbolt 1000(T and 1003) owners stuff the horn to minimize sound output during test runs.