| 摘要 |
A U-type manometer particularly designed for use in measuring the height of liquids of different densities held in containers which features a calibrated measuring tube, a reservoir of manometric liquid connected to the lower end of the calibrated measuring tube, a piston having an aperture therein defining two communicating chambers in the reservoir, the aperture in the piston being at a height substantially equal to the zero level of the manometric liquid in the calibrated measuring tube, a connection between the enclosure containing the liquid whose height is to be measured and the reservoir and means for moving the piston within the reservoir.
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