104

QUANTITATIVE AGRICULTURAL ANALYSIS

Apparatus.—A great many forms of calorimeters have
used for measuring heats of combustion but all of the
successful of these are based upon a measurement of the

FIG. 28.—Section of the Emerson calorimeter.
in temperature produced by burning a weighed sample in oxygen.
at high pressure, in such a way as to have the evolved hea/fc
absorbed by a known quantity of water and by the material of