@thearclampman.bsky.social is very very VERY happy after discovering this conversation on early cinemas and carbon arc lamps.
Memories from those who used them and the levels of details never seen in manuals and history books.
As a professional theatrical projectionist in my younger days, I support this.

I once worked in a booth at a 1920s-era theatre that still had open flame carbon-arc lamp houses & a steel plate-lined booth with a fireman’s pole with a trap door floor to escape if the nitrate film caught fire.

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