GANONGS POTOMETER – GUPTA BRAND 9008028

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 millimeter, 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 reservior. The whole apparatus is mounted on a varnished wooden base by spring clips.

Height to top of reservoir 170mm Diameter of reservoir 20mm Length, overall 320mm Base 20 x 80 mm length x width Capillary bore 1mm As above but on Bakelite Stand

Download PDF

J TUBE SCREW FITTING – GUPTA BRAND 9008034

Glass J tube fromed from 1mm bore thick walled capillary tube, with a brass screw and collar at the end of the longer limb. Used for sampling small quantities of gas held over water(e.g. in photosynthesis or repiration experiments). A bubble of gas is introduced into the short limb. This is then lowered into reagent solution and the bubble moved back and forth so that reagent diffuses through the end water seal. The change in length of the bubble indicates the amount of gas taken up by the reagent.

Download PDF