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
air to the system than is desi^d and hence a Y-tuhe is placed in the 
pipe just before the air enters the ventilator and by opening one 
branch of the Y, room air can be allowed to enter and less air drawn 
through the respiration chamber. The apparatus runs very easily and 
does the work well. Probably it would not give more than 20—30 
ram. of water pressure of air, so it is of no use for forcing gas 
through acid such as is done with our blowers. 
Piping system.—The air is taken from a special pipe about one 
inch in diameter from the street side of the laboratory. Formerly 
Prof. Jaquet took the air from the court side, i.e., the space en¬ 
closed by the hospital building, but under these conditions he found 
noticeable fluctuations in the composition of the air from day to day. 
He considered that in the court the air became more or less stagnant 
while in the street it always circulated well and the air was of 
constant composition. 
(This contention is in marked contrast to Haldane’s experience 
with air in London. There he seemed to find that the ventilation 
was in a vertical direction rather than horizontal..) 
The air passes through about 18 feet of pipe into the chamber, 
or did formerly. There are at present a great many turns back and 
forth as Dr. Staehelin tried to lead the air through ice and salt and 
calcium chloride and obtain water-free air. A large number of 
elbows, joints, couplings, tees, etc., are in the pipe. Each one 
of these connections causes a break in the flow of the gas ahd pro¬ 
duces more or less resistance of itself. Prof. Jaquet criticises 
this arrangement severely. Even with the ordinary union, where 
there is a break in the continuity of the interior of the pipe, 
according to Prof. Jaquet, there is a chance for a vortex motion 
of the air inside the union, thus producing resistance. After the


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