| 摘要 |
Means for determining the velocity and depth of a flowing body of fluid such as fluid flowing in a water or sewer main, said means including conduit means immersed in the flowing fluid, means forcing gas out through the immersed conduit means into the fluid, and other means responsive to the force or pressure required to force gas into the stream, said last-named means being calibrated to indicate and/or record information from which the depth and/or velocity of the fluid body can be determined.
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