World's Largest Round Vault Door

[wylk]

I do not see a bolt-throwing hand-wheel on these doors only a pressure system hand-wheel, nor are there any combination dials or jamb controls... The only jamb control I see is on the Cleveland Trust door in the form of a hand-wheel that I believe operates the entrance platform. There is an interesting electrical panel above it.

Cleveland Trust doors were "automatic" so the bolts were thrown closed by the bolt motor (big springs) when the door was closed, and the time lock would trigger the bolt motor to withdraw the bolts at the appropriate time. Thus there were no holes through the door (or the door frame as with Holmes designs) and no combination locks and no bolt-throwing handwheel. A disadvantage is that in case of riots the door will still unlock itself, allowing access by the marauding mobs.