Abstract
The calorimeter described is suitable for the continuous study of the heat production of microbial systems. The instrument is self-balancing, heat production in a reaction vessel being simulated by electrical heating of an identical balance vessel. A continuous record of the electrical heat supplied to the system is presented on a strip chart. Provision is made for stir-ring, sampling and maintenance of a controlled atmosphere. The vessels may be Sterilized and are inert towards the systems to be studied.

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