Thoday’s Potometer

Catalogue No. 4011950

To measure transpiration, without breakage. Only one glass component (the capillary tube) and is mounted on a strong backing plate. It consists of a capillary tube with millimetre scale connected via a three way tap to a syringe. The cut shoot is connected to the third outlet. It can also be used to measure humidity by connecting a porous pot to the third outlet. Dimensions overall 155 x 165 x 60mm (width x height x length). Capillary tube 120 x 1mm (length x bore).

Catalogue No. 4012600

For experiments in phototropism with seedlings. Three-chambered case of wood with to accept a variety of shutters. The right-hand chamber has windows in the top and back end, when used with a clear front window, acts as a control chamber. Supplied with opaque shutter, a slot shutter to admit light from one direction only, the clear windows for the control chamber, one orange and one blue filter to show the effect of excluding various parts of the spectrum. Complete with three glass containers for seedlings. Dimensions overall 180 × 530 × 180mm approx. (height × width × depth).

Catalogue No. 4012150

Comprises glass tube with upper end of straight limb closed with rubber stopper, lower end of limb with bored rubber stopper to take length of capillary tubing.