Pneumatic tub
Pneumatic tubs are part of typical laboratory equipment . Basically they are just glass bowls or troughs of sufficient size. They do not have any “pneumatic” devices or functions, but rather, through their transparency, are intended to make the course of pneumatic experiments that are carried out with other devices in this tub visually traceable.
Typically, you can use them to fill gases if you set up a standing cylinder filled with water in the tub under the water level with the opening pointing downwards and introduce gas through a hose. Instead of a standing cylinder, test tubes are sometimes used as measuring containers in schools.
literature
- John Parascandola, Aaron Ihde: History of the Pneumatic Trough . In: Isis . 60, 1969, pp. 351-361. doi : 10.1086 / 350503 .