San Francisco : Architect and Engineer, Inc · leaf 54
ly effectivedemonstration, Dr. Fletcher made a so-calledthree channel interconnection, which will be ex-plained later, between two theatres, one ofwhich was located in Philadelphia and the otherIn Washington, D.C. On the stage at Phila-delphia, a carpenter hammered and sawed, andat the same time… … OCTOBER, 1940 soloist sang as she walked across the stage, andother demonstrations of change of locationwere made over the wires to Washington. Thissound was amplified and transmitted to a hornsystem behind a curtain on the theatre stage.It was only v\*hen the curtain before the hornswas lifted…
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