I-.I I'lil 



It should be clearly understood thai i1 i>> the 

 duces the sound, I »u t ccurrence and 



upon the intra-arterial pressure existing during the diastolic pi 

 The cause of the Bound has been shown to depend on tin- p 

 a water-hammer in th<- blood vessels below 1 1n- compression 

 langei B .1 water-hammer is meant the 



are caused by suddenly stopping the Aom of water in a tube W 



sudden pressur curs in tubes »\iili elastic walls, I 



into vibration and bo produce a sound. In the taking 



measurements, ;i^ above described, when the pressure in th<- cuff - 



tween Bystolic and diastolic, the volume <>f the '•••in will 



increase abruptly with each heartbeat ;m<l thus permil 



volume of Bwift-flowing l>l«»<»<l i ( . enter the resl of the 



the cuflP. When 1 1 1 i -> quickly moving column of blood comes int< 



• with the stationary blood filling the uncompressed . 

 cuff, it will become immediately checked, and thus distend il 

 wall with unusual violence and set it into vibration. 



