(under subclass 118) Device including a reservoir which comprises a supply chamber, and a tool-receiving chamber in communication therewith and providing the sole access to the supply chamber, so that the supply chamber is otherwise air-tight; whereby, establishment of a level of material in the tool-receiving chamber serves to prevent further flow of material thereinto from the supply chamber, and whereby removal of material from the tool-receiving chamber by the tool serves to permit flow of a corresponding quantity of material thereinto from the reservoir.
(1) Note. A supply container of this general structure will be recognized as barometric if a drawing thereof discloses the level in the tool receiving chamber as being lower than that in the supply with no means to effect this difference other than atmospheric pressure in the tool chamber.
SEE OR SEARCH CLASS
137, Fluid Handling,
453+, for a barometric liquid level responsive or maintaining system.
222, Dispensing, appropriate subclasses, particularly 437, 457, and 585+, for a dispenser including barometric control.
