| 摘要 |
A level comprises a suitably tubular conduit (2) which is at least partly filled with liquid and which, at least at a first end thereof, is transparent (11) for making visible a first liquid surface (17) for reading, which is located in the conduit and corresponds to a second liquid surface located at the other end of the conduit and serving as reference level. Both ends of the conduit are sealed by means of yieldingly movable means (9, 15) to prevent the enclosed liquid from leaking out of the conduit, but yet allow it to move to a certain, limited extent. The conduit accommodates two liquid masses which are separated by means of a membrane (15') and one (16) of which is contained in that part (11) of the conduit which is transparent and which, in addition to the liquid mass, contains a certain amount of gas (18) above said liquid surface (17), and the other of which completely fills the conduit (2). |
