. Electronic apparatus for biological research . Figure valuable in circuits for producing a 50 cycle signal of variable amplitude and phase for cancelling interference from mains pickup in amplifiers. One such is shown in Figure ; we have C-D Kin B-D in K B-C Kin jcoCR 1 + jcoCR 1 2 1 jcoCR 1 + JcoCR 45

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity