A couple more pics…
The mysterious smoke/heat detector in the cafetorium. I’m almost positively sure it’s a Simplex…
This is in the music classroom. Apparently the Simplex 4051 horn originally there broke down some time this decade, and they replaced it with a Wheelock NS horn/strobe. I assume the light is disconnected (the bulb is still there, but they ripped the lens off), but I do wish that they removed the whole light and just put electrical tape over it; leaving it like that just summons vandalism and the elements.
All the other 4051+4050-80s are still intact. That indeed proves that one alarm in the music room was just a breakdown. The others apparently still work really well. I assume this is how all of the alarms initially looked back when the school was built in 1974; it was all 4051+4050-80s and 4251-30s, with no test stations and a Simplex 4247 panel or whatever. (I apologize for the image size, this is meant to be a detail shot of sorts.)
Oh, and TSS, regarding that 4251-30 with the loose frame, I wonder if the Davis K-8 school ever had a fire at one point and that alarm was pulled because of it?