It Supplants The Oboe -- The British Broadcasting Corporation has devised a generator which supplants the oboe as the source of standard musical pitch for orchestra about to broadcast. The generator is shown in the photograph without its cover. The note emitted by the generator has a frequency of 440 cycles per second - the internationally agreed standard of pitch for A in the treble stave - and is rich in harmonics. Its frequency is maintained to within ??1 part in 2000 of its nominal value. The generator consists of a valve oscillator and a loudspeaker, and is mains-operated. Being light and compact it can readily be taken from studio to studio. November 14, 1951. (Photo by BBC Photograph).