The amount of oxygen that is required for certain tissues to maintain normal life and function has long been a project for investigation. With the Beckman Model 160 physiological gas analyzer, it is now possible to get the approximate range of oxygen required by particular tissues. This polarographic method for study of oxygen tensions is the most desirable one currently available, but it is still not the ideal device. According to Martin,5 efforts have to be made to prevent aging and instability of the electrode, interference by motion, and inaccuracies caused by the effects of temperature and hemoglobin on the electrodes.
The Beckman polarograph works upon an electrochemical system. The tip of the oxygen electrode contains KCL electrolyte solution around the silver anode. The platinum cathode is constructed of 0.0005-inch platinum wire sealed in glass so that only the tip is exposed. The anode is a silver tube, within