Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 4 (1923) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
He has a very clever assistant in Mr. Dirken, who showed us many 
things and who evidently is a man of very superior capacities. Figure 69‘ 
shows Mr. Dirken sitting at the entrance of the calorimeter, which, as 
can be seen, is very small and provided with a heavy pressure window. The 
insulating material surrounding the calorimeter is easily seen, as well 
as the scales for v/eighing the water can at the right of the picture. 
A photograph was taken of Mr. Dirken, the assistant (see figure 70), 
showing him with his apparatus for studying the composition of expired air, 
with the spiral, twisted strip of metal inside the glass tubes to mix the 
air thoroughly. On the right of the picture is shorn the rather elaborate 
battery of gas analysis apparatus used by him for the analysis of expired 
Buytendijk was much interested in developing a magnetic apparatus for 
determining oxygen, on the basis that the oxygen was highly magnetic, 198 
times as magnetic as nitrogen, and he thought by passing the air through 
this electric coil and then noting the secondary current, he could get a 
method of determining oxygen from the induction current. This had not been 
worked out,although several coils had been made. Some of them are lying 
on the table in the photograph (30e figure 71). in this figure one also 
sees part of a respiration apparatus for small animals. This view shows 
the pump and the electric motor. A general idea of the laboratory and its 
manifold interests is shown in figure 72. In the foreground is a sort of 
drogh spirometer. Innumerable tubes, pipes, and connections are also seen, 
illustrating the experimental researches in many stages. 
In teaching Professor Buytendijk had a couple of very interesting 
metabolic charts, showing the metabolic changes in the body and the heat 
production of different individuals doing different kinds of work. Every¬ 
thing was based upon the fact that the avorage man will produce 65 calories 
per hour during sleep. Photographs of these charts were kindly given me 
by Professor Buytendijk.


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