The Making of a Recording
NBC Radio City, San Francisco
While NBC maintained a strict policy of "No Recordings" throughout the 30's and
40's, the recording room still saw lots of activity. Some programs originating in New York or
Chicago were recorded here to "time shift" them to a more appropriate hour for the West Coast.
The recording restriction also did not apply to programs broadcast only on the local stations,
KGO and KPO.
In this view, the engineer is inspecting the cutting depth by viewing the
recorded grooves through a microscope.
The microscope contained a graticule which allowed direct measurement of the
cut depth by measuring groove width.
The vacuum hose at the center of the turntable was
used to extract the acetate shavings removed from the disk in the recording process.
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