Bauhaus-Universität Weimar

Titel:
Reports of Visits to Foreign Laboratories, vol. 7 (1932-33) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Person:
Benedict, Francis Gano
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39750/87/
On this particular day they were having about 300 liters per 
minute ventilation of the helmet with carbon dioxide of about 0.7. 
In the calculation of results Krogh uses not an average carbon 
dioxide and oxygen of outdoor air but^ he says.that which is actually 
determined on these days and finds changes in the third decimal 
place only, but does not use 0.032 and 20.940 as constant. The 
pulse is taken by placing the finger on the carotid and they count 
for a fraction of a minute with a watch, reading the revolutions 
per 15 seconds. They find the pulse very, very constant all during 
riding and indeed from day to day. They also take it before the 
respiration experiments with the helmet off. 
The subject was able to talk regularly in spite of the heavy 
work and there was no excessive panting but mouth breathing and 
sweat on the forehead. In fact, I noticed mouth breathing after the 
subject had been riding about five minutes. The control of the blood 
carbon dioxide was taken so as to control the respiratory quotient 
and this showed little or no "aspumpung". 
For the rectal temperatures there was a thermo-junction, small 
with wires going out backward from buttocks instead of from the front 
The constant temperature junction was held at 50° and they used a 
Hartmann and Braun voltmeter, each millimeter corresponding to 0.3°. 
They felt that reading this needle with a mirror back of it as with 
the ordinary voltmeter one could read it to 0.1 mm., which should 
correspond to 0.03°. 
The subject wore only running trunks with the torso and legs bare. 
Two electric fans played over the chest and back all the time. (See 
figures 7 > “4% > and <-/^.) On this particular day 
something was wrong with the rectal thermometer. They seemed to think 
it was due to insulating, and as they had drawn two wires through a 
rubber tube the insulating was probably injured. Their rubber tube 
was a little smaller than ours but not much. 
Along with the metabolism measurements there were many other 
observations made on this subject, a most intelligent man, who was 
one of the collaborators in the research and likewise acted as 
subject. Before knowing that this subject was one of the collaborators 
I put him down as an extremely intelligent subject, as he seemed to 
be running the whole show himself. Blood samples were taken by 
pricking the finger and squeezing it very hard. The hand was placed 
in warm water previously to have a greater flow of blood. There were 
also samples taken for fat soluble acids. Everything was on the 
micro basis. To take the sample a small celluloid tube 4 cm. long 
and 2 to 3 mra. in diameter with a flare at the lower end was attached 
by collodion to the finger prick. The blood was thus given a minimum 
exposure to air and then the blood was syringed out of this celluloid 
tube or little standpipe. They first tried taking it over paraffin 
but it did not go well. I wondered why they did not take blood from 
a vein as Dr. Root does. As it is now they make many tests on the 
finger by squeezing it. They claim that acid goes up at the beginning 
of work but there is no control on the corpuscle content. I wonder
        

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