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An apparatus is described which automatically records the absorption or evolution of gas in a system maintained at constant pressure. A control device based on sensitive metal diaphragms responds to changes from the reference pressure, and actuates the movement of a metal bellows to compensate for changes of gas volume. An electric motor driving the bellows simultaneously rotates a helical potentiometer which governs a recording potentiometer. Selection of suitable components permits sensitive operation over a wide range of pressures and temperatures.
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Neighbour et al. (1964) studied this question.
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