. Industrial gas was kept constant, showed that the regu-lator could not be relied upon to maintain a constant flow of gasover a considerable period of time to better than about percent. However, such variations of gas flow would introduce noserious error into a calorimetric measurement in which simulta-neous measurements are made of the water flow and the gas flow. If only one pressure regulator is used, it will usually be prefer-able to connect it between the gas supply and the meter ratherthan between meter and burner, as the inlet pressure at themeter will then be practic
. Industrial gas was kept constant, showed that the regu-lator could not be relied upon to maintain a constant flow of gasover a considerable period of time to better than about percent. However, such variations of gas flow would introduce noserious error into a calorimetric measurement in which simulta-neous measurements are made of the water flow and the gas flow. If only one pressure regulator is used, it will usually be prefer-able to connect it between the gas supply and the meter ratherthan between meter and burner, as the inlet pressure at themeter will then be practically constant from day to day, and thesmall movements of the float, with their resulting variations involume, will introduce no errors in the assumption that the volumeof gas measured is equal to that burned. If a float regulator of the usual type furnished with flow calo-rimeters is used, a difference in the position of the float amountingto one-sixteenth inch at the beginning and end of an experiment Technologic Paper No. 36.
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