Compressed Air; Low Pressures 



757 



reach one atmosphere of pressure above normal, at the same time 

 being under a current of pure air which is sufficiently strong to 

 keep the temperature in the chamber from rising more than 2 or. 5 

 degrees. 



Fig. 62 — Apparatus of M. Jourdanet for the therapeutic use of compressed 

 or expanded air. 



The number of heart beats was counted for five minutes, to 

 avoid causes of error against which often no precautions are taken. 

 The number of respirations was counted for 5 and often 10 minutes. 



