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 the Department of Health. 
Engineer Sondên. 
One of the most active cooperators in the develO; / lent of :: 
respiration apparatus at Stockholm is Engineer Sondên, a man of re¬ 
markable technical skill and the greatest ingenuity. His relations 
with the University are not direct and fce has a special laboratory in 
what corresponds to our Board of Health. He has been especially 
interested in the Pettersson gas analysis apparatus and is at present 
working upon a modification of this apparatus with a view to determining 
the amount of oxygen in normal air with great exactness. This was 
done primarily with the idea of studying the differences of oxygen 
content in air under varying hygienic conditions. recognizing the 
great accuracy and sensitiveness of the Pettersson apparatus for 
determining carbon dioxide, Sondên believes that the same principle may 
be adapted for the determination of oxygen. His attempts to secure 
this accuracy have, as yet, however, been unsuccessful. The appara¬ 
tus upon 'which he has been working is extremely complicated and is 
shewn in igs. 69 and 70« He is attempting to determine oxygen by 
admitting to the air a definite volume of pure hydrogen^ passing this 
through a quartz tube containing platinum which is heated to incandescence 
and then determining the diminution in volume. 
Sondên objects to the usual method of determining oxygen by 
absorption in a solution of either potassium pyrogallate or sodium 
hydrosulphite » on the ground that the e is a variation in the partial 
pressure of nitrogen at the beginning amd, end of the experiment. The 
ground is well taken theoretically but the difficulties of determining


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