The laboratory room is entered from the main hall by a double door. The
room is 14.2 meters long by 10.1 meters wide, and is lighted on three
sides by 7 windows. Since the room faces the north, the temperature
conditions are much more satisfactory than could be obtained with any
other exposure. In constructing the building the use of columns in this
room was avoided, as they would interfere seriously with the
construction of the calorimeters and accessory apparatus. Pending the
completion of the five calorimeters designed for this room a temporary
wooden floor was laid, thus furnishing the greatest freedom in placing
piping and electric wiring beneath the floor. As fast as the
calorimeters are completed, permanent flooring with suitably covered
trenches for pipes is to be laid. The room is amply lighted during the
day, the windows being very high, with glass transoms above. At night a
large mercury-vapor lamp in the center of the room, supplemented by a
number of well-placed incandescent electric lights, gives ample
illumination.