ture of outcoming water; G, can for collecting water
from calorimeter; _f_, valve for emptying G.]

The water descends from this tank in a large 2-inch pipe to the ceiling
of the calorimeter laboratory, where it is subdivided into three 1-inch
pipes, so as to provide for a water-supply for three calorimeters used
simultaneously, if necessary, and eliminate the influence of a variation
in the rate of flow in one calorimeter upon the rate of flow in another.
These pipes are brought down the inner wall of the room adjacent to the
refrigeration room and part of the water circuit is passed through a
brass coil immersed in a cooling-tank in the refrigeration room. By
means of a by-pass, water of any degree of temperature from 2 deg. C. to
20 deg. C. may be obtained. The water is then conducted through a pipe
beneath the floor to the calorimeter chamber, passed through the
absorbers, and is finally measured in the water-meter.

A diagrammatic sketch showing the course of the water-current is given
(fig. 14), in which A is the tank on the top floor controlled by the
ball cock and valve, and _a_ is the main valve which controls this
supply to the cooler B, and by adjusting the valve _b_ and valve _c_
any desired mixture of water can be obtained. A thermometer C gives a
rough idea of the temperature of the water, so as to aid in securing the
proper mixture. The water then passes under the floor of the calorimeter
laboratory and ascends to the apparatus D, which is used for heating it
to the desired temperature before entering the calorimeter. The
temperature of the water as it enters the calorimeter is measured on an
accurately calibrated thermometer E, and it then passes through the
absorber system _d d d_ and leaves the calorimeter, passing the
thermometer F, upon which the final temperature is read. It then passes
through a pipe and falls into a large can G, placed upon scales. When
this can is filled the water is deflected for a few minutes to another
can and by opening valve _f_ the water is conducted to the drain after
having been weighed.

_Brine-tank._--The cooling system for the water-supply consists of a
tank in which there is immersed an iron coil connected by two valves to
the supply and return of the brine mains from the central power-house.
These valves are situated just ahead of the valves controlling the
cooling device in the refrigeration room and permit the passage of brine
through the coil without filling the