| 摘要 |
A plastic vessel forming a float is secured to one end of a plastic tube. The other end of the tube is fixedly mounted and intermediate the ends is a hinge section. Two mercury switches are positioned in the vessel at different angles of inclination with respect to the axis of the vessel so that as the vessel pivots about the hinge with variations in the level of the liquid upon which the vessel floats, the switches close at different positions of the float. The angle of inclination of one of the mercury switches is adjustable.
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