INSTRUMENT FOR INDICATING LIQUID LEVELS

摘要

An instrument for indicating the level of a volatile liquid in a reservoir formed of a casing, a bellows so disposed in the casing as to provide a space between the casing and the bellows, an inlet conduit extending through a side of the casing into the space which connects the casing with the reservoir, an outlet extending from the space through the top of the casing which is normally closed but is openable to atmosphere, and a connection between the bellows and an indicating device.