Figure *4 4. Copenhagen, Denmark. University of Copenhagen,
Laboratory of Zoophysiology. View of Krogh's respiration apparatus,
showing large housing for gas meter at the right with little black
level index showing that the water is at a constant level. Chair
for subject to sit in when resting in front of handle bar of
bicycle ergometer.
Figure t ^ • Copenhagen, Denmark. University of Copenhagen,
Laboratory of Zoophysiology. Photograph shows Krogh ergometer at
the right. At the left is the box housing one of the large gas
meters, showing the constant level device on the side of the box.