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.