For demonstration of transpiration rates and rates of water absorption by a cut shoot under various external conditions.
Base: 20 x 80mm
Capillary Bore: 1mm.
A plant shoot is sealed into a stopper which fits the end tube and the whole apparatus is filled with water.
The open end of the capillary tube is dipped into a beaker of water.
The position of the air bubble may easily be adjusted by opening the glass stopcock to admit water from the reservoir.
The whole apparatus is mounted on a varnished wooden base by spring clips.