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2) 
Improved Eudiometrical Apparatus, by Dr. Hare. 
CORBONICOMETER. 
The apparatus here represented, 
is one which I have contrived, for 
withdrawing a known portion of re- 
sidual air from the barometer gage 
eudiometer, in order to wash it with 
lime — 
es ipe, which causes a com- 
SP pee between the upper part 
of the receiver, R, and the cavity 
under the hollow pedestal, B. The 
lower orifice of this pipe, where it 
enters the cavity of the pedestal, is 
covered by a valve opening down- 
wards. The receiver is surmount- 
ed by a brass cap, into which, as 
well as the socket in the pedestal, it 
is cemented air tight. In the axis 
of this receiver, and descending 
nearly to the bottom, may be seen a 
tube, which is soldered into a per- 
foration communicating with the 
inside of the receiver and that of 
the globe, - 
instrument, and the globe, G, may be easily opened or sus- 
pended at pleasure. 
Suppose the receiver, R, to be occupied by lime water, as 
represented in the figure. Place the —— B, over the 
in the air pump plate, which the rim of the pedestal is 
ground to fit. On wo orking the pump, the air of the receiv- 
er, above the lime water, is drawn out through the valve at 
the bottom of the pipe, P. Of course, the air in the globe 
follows i it through the pipe, which leads from it into the re- 
ceiver. Having exhausted the globe and receiver, if the 
