The maintenance of isobaric conditions at pressures of the order of 10 000 lb/in.2 is sometimes a difficult operation in transport studies. A manostat has been devised which will maintain isobaric conditions with a precision of about 1 part in 100 000 at pressures from 500 to 10 000 lb/in.2. The equipment functions satisfactorily as a pressure transducer for control purposes.

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