| 摘要 |
A mercury system for use as a level and as a manometer. A pair of cisterns with interconnected pools of mercury and with a float in each cistern serving as the lower plate of the cistern capacitor. A resilient sheet attached to the float and to the cistern for sealing the mercury in a lower chamber of the cistern. An alternative diaphragm consisting of a thin resilient sheet closing the mercury pool with the surface of the pool serving as a capacitor plate. A bellows unit connected in the mercury line between the cisterns for controlling the mercury level in the cisterns.
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