Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 2 (1910) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
tubes at once may be seen in Pig. 16. By weighing all of these tubes at 
one time, he obtains the total amount of carbon dioxide absorbed, but as his 
purifying train consists of caustic potash, soda lime, and sulphuric acid in 
in different vessels, he is unable to differentiate between the amount of 
carbon dioxide absorbed by the caustic potash and that absorbed by the soda 
lime. The air passes through these U-tubes at the rate of about 3 liters 
per minute. A small mechanical suction pump in the basement is used for 
mixing the air current. The Geryk vacuum pump formerly employed is now 
used in connection witn a large vacuum drying oven for drying feces. 
Determination of carbon dioxide in the bomb.- After a combustion in the 
bomb calorimeter, the gas is allowed to escape and pass through a gas meter 
where it is measured. The carbon dioxide is absorbed by passing the gas 
through a train of purifiers and in this way the carbon in food, feces, and 
urine is determined. The bomb, which was made by Julius Peters of Berlin, is 
very large and appeared to be about three times the size of the one used in 
this laboratory, but of exactly the same design. 
Thermo bar omet erIn tne basement of his laboratory, Professor Hagemann 
has installed a new form of thermobarometer, and uses it in direct connection 
with an Sister dry gas meter. I could not get the details of this thermo¬ 
barometer or even a photograph of it as tne room was so dark. Professor Hage¬ 
mann is very entnusiastic about it. He reads the meter, corrects the ingoing 
air meter Dy this, and tnen corrects the meters taking air from the two pans, 
and thus has a double check on the reduced volume ox ventilation as given by 
tne meter pump. He snowed me some figures whicn seemed to agree very well out 
I did not follow tne calculations. 
Sheep experiments.-I found tnat Professor Hagemann had made digestion 
experiments with sheep, using the harness and urine tubes. Some of the ex¬ 
periments covered a period as long as two and a half months. The sheep lie 
down and. seem in every way comfortable.


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