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
Laboratory of Physiology, Karolinska Institute. 
Prof. J. E. Johansson and Dr. Ernst Landergren. 
This laboratory is especially noteworthy as being the source of a 
large number of experiments with the original Sondên-Tigersteat res i- 
ration apparatus. Since Prof. Tigerstedt removed to Helsingfors, Prof. 
Johansson has had charge of the laboratory and although his interests 
are in a large measure sociological and statistical, yet experiments 
have been in more or less continuous progress ever since Prof. Tiger¬ 
stedt left. 
Sondên-Tigerstedt respiration apparatus.--This apparatus, i. ;d 
by Prof. Tigerstedt in company with the engineer Sondén, was first 
constructed in this laboratory. Since that time the chamber in 
Helsingfors was built. The chamber contains 100 cubic meters and is a 
small laboratory room lined with sheet zinc. Aside from some minor 
details, it is essentially the same apparatus as that in Helsingfors. 
Ventilatlon.—The ventilation of this apparatus depends wholly 
upon the nature of the experiment. Originally designed for studying 
the carbon dioxide output of a large number of individuals at the same 
time, it has been used for the most part for experiments with only one 
individual. Apparently, as far as I could Judge, very little thought 
was given to the ratio of the ventilating air current to the carbon 
dioxide content. 
At the time I visited the laboratory, experiments were being made 
with a single subject at absolute rest with a ventilation of 16 cubic 
meters per hour. 
Two very large gas meters, furnished by the f}as Meter


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