GANONG’S POTOMETER

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 millimeters, 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 320 x80mm(L x W), Capillary bore 1mm.