Leveling scale

The leveling scale (also sewer scale ) is a simple, self- leveling ( self- leveling ) geodetic measuring instrument based on the principle of connected vessels (see communicating tubes ). It is the forerunner of the level and is used to create a horizontal target line.

The channel balance consists of two vertical glass cylinders, which are connected to each other over a 1–2 m long stretch like a hose balance and are often filled with a colored liquid. The two liquid surfaces in the cylinders form the leveling line. The device is typically on a transportable base ( tripod ).

The aiming accuracy is poor, as the aim is with the naked eye. Usable measurements are only possible over short distances (approx. 50 m), so that this instrument has only historical value today. Nevertheless, impressive structures (bridges, viaducts , aqueducts, etc.) were precisely measured with it in the past .

literature

• Heinrich Carl Wilhelm Breithaupt, Collection of the Most Excellent Mathematical Instruments , 1803, p.38