To demonstrate rates of transpiration and of water absorption by a cut shoot, with a graduated capillary tube bent down at right angle at one end with a small orifice and having water reservoir with glass stopcock and the end tube with rubber stopper for the plant shoot at the other end, on base.

Metal body with heavy base, fitted with a 30 hour clock drive which rotates the plant holder at one revolution per hour. Can be set at any angle between horizontal and vertical positions, complete with plant holder.

An electric motor rotates a drum in 15 minutes. The drum consists of a cork table to which germinating seedlings are pinned and has a perspex cover 105 x 100 mm (height x dia). A stand enables the angle of the cork table to be set at any desired inclination. Works on 240 V AC.