. Electronic apparatus for biological research . HT+ 300 V ^Output to scaler Fipire A simple probe circuit { Probe type 200) more conveniently, often, arranged in cascade, driving a mechanical register: but the development of Dekatron counting tubes seems likely to supplant the hard-valve circuits, except for the first stages of scalers designed to operate at very high counting rates. The sensitivity of the scaler, taking into account some amplification of the pulses by the probe unit, is normally such that a 0* c c o Operating potential Starting potential _J

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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity