Professor Marangoni, of Pavia, has invented an aspirator for measuring
gases which is much simpler than many now in use in laboratories,
which latter have the defect that the air or gas ascends through
the descending liquid and makes thus the measuring of the former
uncertain. The improved apparatus is shown in our illustration. It
consists of two vessels attached to a fixed horizontal shaft, FE,
which is placed upon two upright supports. This shaft has several ways
or passages made in it which performs the functions of the taps.
The water of the upper receptacle passes into the lower one by the
passage, A, and thence through the tube, BC, issuing at its lowest
extremity at C. The air contained in the lower vessel is thus emitted
by the channel DE, cut into the shaft, while the air or gas is
aspirated in the same ratio by the passage and tube, FG. The apparatus
acts thus at the same time as aspirator and compressor. It is simple,
and will be a useful addition to the laboratory.
[Illustration]
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