Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 1 (1907) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
Physiological Laboratory of the Guy's Hospital I'edical School. 
Dr. Pembrey. 
At the time of my visit Prof. Haldane of Oxford was giving a 
series of lectures at this medical school and hence I was able to see 
him and discuss many points of common interest. 
With regard to ventilation, Prof. Haldane maintains that if the 
wet bulb hygrometer is kept low, there is no trouble with ventilation. 
With a submarine, he has made experiments in which the carbonic acid 
was over 3 per cent for 24 hours. In 1? hours no lamp will burn but 
obviously in this experiment the moisture was condensed. Singularly 
enough, the sides of the' vessel were painted with cork paint so there 
were no signs of moisture since the cork absorbs the moisture and does 
not sweat. 
Prof. Haldane is not in sympathy with the Punt2. method, 
that the men should not be made to move the meter. The expirations 
are intermittent and as the last portion of the expiration is richer 
in carbonic acid, it is possible to get a higher carbonic acid content 
than really exists. The meter moves intermittently and especially 
at the last part of the respiration, there may be a very marked error 
in the sample. 
Prof. Haldane himself has a motor to suck air through a long tube 
and he breathes through a T-tube inserted in this long tube. He says 
the meter go quires only about twice as much as the expired air. 
if it is 7 liters per minute, the motor is adjusted to draw 14 liters 
through the tube.


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