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Page:Popular Science Monthly Volume 57.djvu/193

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the pressure little by little, in order to compensate for the increased loss due to increased flow through the mains. At 6.15 p. m. (B), the works ceased increasing the pressure. While this increase lasted—from 6.15 p. m. (B) to 10.15 p. m. (C)—our friend near the works suffered under twenty-one tenths pressure, the gas blowing merrily through the tips and the meter conscientiously registering gas wasted as well as gas utilized. From 10.15 p. m. (C) the pressure falls by steps during the ensuing two hours, finally reaching eleven tenths just after

PSM V57 D193 Pressure recorder indicating high abnormal gas flow.png
Exhibit 3.

midnight (D), which latter pressure is quite steadily maintained until the following forenoon. The service from bedtime to dinner time should have proved quite satisfactory. One would naturally expect to find this consumer complaining of high bills, however.

Visiting the fellow at the distant end of the line, we find conditions widely at variance from those already considered. Exhibit 2 tells a new story. The recording gauge was placed in service at 4 p. m. (E), and shortly afterward (A), the pressure began to fall. The jets grew dimmer and dimmer, while the Welsbach mantles became petticoats of