226 



H. M. JOHNSON AND FRANKLIN C. PASCHAL 



tXti-il^ Dur,IKl M mUWM U -CO*. 



oli Uuett ... 





June 9 1919. No. 6926, private, Medical Department, twenty, photographer, 

 non-flyer. 



Three-quarter hours in air as passenger. Run was preceded by 13 minutes' 

 rebreathing during which the oxygen was replenished as consumed. 



Had previously transliterated all the material once under normal conditions: 

 hence there is little improvement with practice. 



Performance showed a slight and gradual decline in the early stages, with 

 subsequent steady improvement due to increased effort. Deterioration began 

 in the 24th and 25th minutes between 11 and 12 per cent oxygen, and increased 

 rapidly until the experiment was terminated by the clinician. 



The changes in the systolic blood pressure present an interesting parallel to 

 the fluctuations in performance. The reading in the 7th minute was made dur- 

 ing a period of rest. 



