| 摘要 |
Apparatus for comparing the level of two spaced points, to find which is higher or lower, and possibly also for determining the magnitude of the difference in level of the points. The apparatus comprises two chambers that communicate with each other through a flexible conduit. The conduit and the lower portion of each chamber is filled with liquid, preferably mercury, whose level in each chamber varies as the elevations of the chambers relative to each other. An electric circuit interconnects the chambers; and the circuit is opened or closed upon variation in the relative levels of the chambers; or the amount of current flowing in the circuit is progressively changed with changes in the relative elevation of the chambers. Various embodiments of circuit for achieving this are disclosed, including make-or-break contacts, a variable capacitor, a variable resistance slide wire, and a variable resistance deformable strain gauge. A solid member in each chamber moves with the liquid in the chamber to actuate the electric circuit.
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