An Electrolytic, Digital Recording, Multichannel Micro-Respirometer

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Abstract
A 20-channel micro-respirometer is described which replaces oxygen consumed by the respiring organism by that generated by the electrolysis of saturated copper sulphate solution. Electronic circuitry checks each respirometer once every second and provides a square-wave pulse 0·1 sec long and 1·0 mA in amplitude if oxygen is required. A single pulse produces 5·7 nl of oxygen at S.T.P. Electromechanical counters record when a pulse is required for oxygen generation. Total errors introduced by the electronics amount to less than 0·1%.