The Heinze gas-volugraph is an instrument designed to measure gas-volume changes at ambient temperature and pressure and to record changes in gas-volume corrected to 'standard' temperature and pressure. This instrument is used in the quantitative volumetric determination of carbon dioxide evolved from the reaction of acid with prepared samples of rock containing carbonates.The instrument records the amount of gas evolved as a function of time and presents this information as a graph. Other important features include: (1) a liquid dispenser mechanism which combines the liquid and sample in such a manner as to eliminate the need for volume corrections; and (2) a compensator mechanism which permits direct recording of gas volumes corrected to STP conditions.In Saskatchewan the carbonate content of tills has been determined gasometrically by geologists using this apparatus. The results have been used to trace the stratigraphic succession of tills across parts of the province.

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