98 EXPERIMENTAL PHYSIOLOGY 



the oscillations are greatest is the measure of diastolic or average 

 pressure. On further raising the pressure the oscillations again become 

 smaller, as the brachial artery is now becoming occluded. When it is 



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i: 



A - 



% s 



completely occluded the pulse ceases to be felt at the wrist ; this point 

 is the measure of systolic or maximal pressure. 



It is not always easy to determine the exact point at which the 

 pulse ceases to be felt. The difficulty was got over by Oliver, who 



