(under subclass 81) Devices of the type in which the fluid pressure (or vacuum) acts upon a body of conductive liquid causing the latter to move so as to open or close a circuit including the conductive liquid.
(1) Note. The fluid pressure or vacuum may be applied either directly to the conductive liquid, or indirectly through a piston or diaphragm, so that the change in pressure
causes liquid motion, as distinguished from fluid pressure operated means that cause change in position of a liquid contact switch, liquid motion being due to such change in position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
182+, for miscellaneous circuit makers and breakers employing liquid contact means.
200+, for periodic circuit makers and breakers employing liquid contact means.
SEE OR SEARCH CLASS 73, Measuring and Testing,
747+, for manometric type pressure gauges.
337, Electricity: Electrothermally or Thermally Actuated Switches,
122, and 331 for electrothermal or thermally actuated switches with conductive fluid contacts.
