The R101 Inquiry
SX microphones and four loudspeakers were used. at the official inquiry in London into the R101 disaster. The installation included an ingenious system of control-whereby: the various microphone circuits could be -cross-con-nected so that questions and answers from different: parts of the hall could be heard clearly by all, concerned. —
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310109.2.58
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Radio Record, Volume IV, Issue 26, 9 January 1931, Page 19
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53The R101 Inquiry Radio Record, Volume IV, Issue 26, 9 January 1931, Page 19
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