270
Pig. 82* general view of the Tlssot spirometers in Chauveau*s
laboratory» Paris, Prance.
The two large spirometers at the right each contain 210.5 liters,
and are so adjusted that they can he read to one-half liter. ThB
small spirometer in the centre of the picture contains 65 liters
which can he read to one-fifth of a liter. At the right of the
small spirometer is the glass tube drawn out to a capillary for
purifying mercury, mentioned on page 178. On the table are a
large number of wine glasses containing mercury for the préserva-
tion of s.imples from the dog respiration apparatus. On the
enamelled lava topped table at the left is an elaborate kymograph
and between the two large gasometers can be seen the top of a
compresséd oxygen cylinder. On the skeleton above each of the
spirometers is attached the recording device for graphically
recording the height to which each spirometer rises after each
expiration.