Abstract: The device senses the level of a float which may rest on the surface of the liquid whose level is to be determined or may rest on the surface of liquid (e.g., mercury) of a manometer which measures the level of liquid in accordance with the purge bubble principle. The fluctuation of the float turns a pulley which causes oscillatory movement of an arm carrying a magnet. In proximity to the path of the magnet is a board carrying radially disposed, angularly spaced reed switches. As the magnet passes each switch it closes same and passes a signal to a digital accumulator. A slip clutch between the arm and a second arm causes the latter to oscillate in the same direction as the first arm, but only for a limited distance. The second arm also carries a magnet which changes the direction of a second reed switch and dampens hunting of the first series of switches by preventing activation of the accumulator except when the second reed switch is closed.

Abstract: For recording precipitation at a remote station, a vertically mounted pipe is divided into an upper section (into which rain and snow fall) and a lower section. In the upper section is an overflow module consisting of a casing having openings in its bottom communicating with liquid in the upper section so that liquid level inside the casing is at the same level as in the upper section. An overflow pipe extends up from the lower section and through the bottom of the casing. A float and bellows is fixed to the upper end of the overflow pipe and an upper extension pipe is fixed above the bellows. Wires fixed to the upper extension pipe are attached to bi-metallic spirals which work against the bellows. Thus the elevation of the liquid inlet at the upper end of the upper extension pipe is temperature responsive. The upper member is initially partially filled with an anti-freeze solution to the level of the liquid inlet.