The Cambridge School of Agriculture.
Dr. Capstick, Dr. Deighton, and. Mr, Morgan
The main object of our visit to Cambridge was to see the calorimeter
begun by A. V. Hill and completed by Capstick in the agricultural
building. This apparatus is an extraordinarily accurate calorimeter. There
are as yet absolutely no provisions for ga3 analysis, either oxygen, carbon
dioxide, or methane, but only heat. The water is determined by wet and dry
bulb thermometers in the ingoing and outgoing air. The fact that the water
must be reasonably well detemined, however, is borne out by the fact that
the alcohol check experiments published by Cap3tick are very accurate.
The calorimeter is a huge affair with an enormous mass of metal.
A very indistinct, unsatisfactory photograph (see figureS/) was taken
by means of a piece of burning, metallic magnesium ribbon, but this
photograph gives an idea of the construction of the chamber, the grating
at the rear, the trough for the pig to feed out of at the left, and the
heat absorbing pipes at the top. There is also a large coil of very heavy
lead pipe outside of the can, of which Mr. Capstick complained a great
deal, owing to the mass of metal. A photograph of the front of the
calorimeter, with the door closed, is given in figure SI?. This view shows
the heavy insulated construction of the door and the air pipes leading
into the chamber, with two thermometers for wet and dry bulbs. It was
extremely difficult to photograph this apparatus, owing to the laboratory
room.
Figures ^ and °\0 are photographs taken at the rear of the chamber,
showing the manometer for indicating the flow of air through the chamber,
a recording photographic registration apparatus below, indicating
manometric pressures, and various other physical connections for the thermo
elements and resistance thermometers. The ventilating blower is seen at
the extreme left, lower corner, in figure