CHAPTER VI TTHE COMPOUNDS OF NITROGEN WITH HYDROGEN AND OXYGEN
Fig. 51.—Natterer's apparatus for the preparation of liquid nitrous oxide and carbonic anhydride.
The gas first passes though the vessel V, for drying, and then into the pump (a section of the
upper part of the apparatus is given on the left). The piston t of the force pump is moved by the
crank E and fly-wheel turned by hand. The gas is pumped into the iron chamber A, where it is
liquefied. The valve S allows the gas to enter A, but not to escape from it. The chamber and
pump are cooled by the jacket B, filled with ice. When the gas is liquefied the vessel A is unscrewed
from the pump, and the liquid may be poured from it by inverting it and unscrewing the
valve v , when the liquid runs out of the tube x .
