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
The cranes are provided with chain heists and run on beams 
and girders overhead. They are used principally for removing 
large panels, lifting platforms, and during construction they 
were of very great value in handling wooden Joists, iron con¬ 
struction of parts, etc. With the chain hoist and friction 
clutch or catch to hold up the weight until tripped, the largest 
pieces could be handled most easily. Provision has been made 
for installing this system in the new laboratory. 
Meter pump.—A meter pump, the precise counterpart of that 
used by Prof. Armsby at State College and by Prof. Tangl in Buda 
Pesth, is used in Prof. Hagemann’s laboratory. It is enclosed 
in a wooden house with glass doors. It is based upon the 
Blakeslee principle but was constructed by Hart of Poughkeepsie. 
In both Bonn and Buda Pesth, its construction is severely criti¬ 
cised as the valves are not tight. 
Air pump.—For drawing the samples of air through the various 
U-tubes for analysis, a partial vacuum was needed. Prof. Hage- 
mann has installed for this purpose a Geyrk vacuum pump. This 
is a very expensive pump but it runs in oil and requires no 
attention. There is an independent motor driven with an enclosed 
worm gear. The motor is almost noiseless and there is no sound 
save for the clicking of the valves. It is also piped so as to 
compress the air. The compressed air is used for the stirring 
of the brine in the water cooler. 
Of especial interest were the motor transmission and, the 
worm gear reduction which may be of value in our new unit 
respiration apparatus with an independent motor.


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