. Industrial gas I- E - 30 C 12- -25 1JO 20 ^8- — -4— —5- -e 1 .j H. Fig. 3.—Laboratory gas meters Industrial Gas Colorimetry 25 To reduce the error in adjusting the water level this adjustmentshould be made when the drum is in a definite position, e. g.,when the index is at zero. The index should therefore be sosecurely fastened to the shaft of the drum that it can not easilybe displaced relatively to it. There are four points in each revo-lution of the drum when there are considerable fluctuations of thewater level and the index should be so mounted on the shaft asto pass throu
. Industrial gas I- E - 30 C 12- -25 1JO 20 ^8- — -4— —5- -e 1 .j H. Fig. 3.—Laboratory gas meters Industrial Gas Colorimetry 25 To reduce the error in adjusting the water level this adjustmentshould be made when the drum is in a definite position, e. g.,when the index is at zero. The index should therefore be sosecurely fastened to the shaft of the drum that it can not easilybe displaced relatively to it. There are four points in each revo-lution of the drum when there are considerable fluctuations of thewater level and the index should be so mounted on the shaft asto pass through zero about halfway between two such fluctuations. Descriptions of special features of construction of gas metersmay be found in trade catalogues. Two of the meters used in thisinvestigation are illustrated in Fig. 3. The volume of gas delivered per revolution depends upon thevolumes of the compartments of the drum and upon the positionof the surface of the water. Hence, it is important that the waterlevel be accurately reproducible. This is secured by mounting themeter on
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