Darwin’s Potometer

Catalogue No. 4012050

Comprises a narrow bore bent glass tube clipped to a scale 0 to 30cm x 1mm and fitted by a rubber stopper in a wide mouth bottle. The stopper is also fitted with a dropping funnel and has a
hole to take the stem of a plant.

Catalogue No. 4012100/2

Comprises a graduated, narrow bore, horizontal glass measuring tube with a vessel for a plant shoot at one end and having a vertical limb with a stopcock and a funnel fitted by a ground glass joint. Mounted on a wooden stand. For Demonstration, of transpiration rates and rates of water absorption by a cut shoot under various external conditions. 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, which is graduated in millimetres, dipping 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 central reservoir. The whole apparatus is mounted on a varnished wooden base by spring clips. Comprises a graduate, narrow bore, horizontal glass measuring tubes with a vessel for plant shot at one end and having a vertical limb with a Teflon stopcock and a funnel fitted by a ground glass joint. Height to top of reservoir 170mm, Diameter of reservoir 20mm Length, overall 320mm, Base 320x80mm (L x W), Capillary bore 1mm.

Catalogue No. 4011850

For inhaled and exhaled air tests. Comprises two 150x19mm borosilicate test tubes each with stopper and two lengths, one short, and one long, of 5mm glass tubing, connected by PVC tubing and plastic T.