Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 421
ho mightin case of fire or panic make a simultaneous rush forthe exits. In case of such emergency, the unusualpressure of the crowd causes the revolving structureto instantly collapse, and swing outwardly, foldingtogether like a fan, thus furnishing a full and freeexit. The accompanying…
Building materials
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