CALORIMETER LABORATORY. 5 



The barometer is on the south wall of the room, to avoid temperature 

 fluctuations, and a special electrical recording apparatus for recording tem- 

 perature differences is placed on the north wall near the windows, where it 

 may be conveniently observed either from the observer's platform or from 

 any subsequent platform that may be built. Pending the construction of 

 other calorimeters, apparatus for gas analysis, spirometers, and special appa- 

 ratus for studying the respiratory exchange are placed in the east end of the 

 room. On the inside wall, near the double doors, are the telephone and racks 

 containing the extra carbon-dioxide absorbing cans. 



It is thus seen that the room as arranged permits the concentration of 

 all the physical observations and chemical work in the center of the room, 

 the calorimeters lying on either side. The bed calorimeter is so placed that 

 the subject can easily be brought to its front end on a stretcher and slid 

 into the chamber easily. The subject enters the chair calorimeter from the 

 top. The other calorimeters will have entrances facing the center aisle, so 

 that the subjects and apparatus can be placed inside without difficulty. The 

 subjects will also be under more general observation by having the entrance 

 openings toward the center of the room. 



A general view of the laboratory taken at the right of the main door is 

 shown in figure 2. In the immediate foreground is seen the balance for 

 weighing the absorber system. A porcelain sulphuric-acid vessel is shown 

 suspended on the left-hand arm of the balance. The large lead counter- 

 poises used for weighing are on the shelf in front of the balance at the right. 

 On the floor of the laboratory, in front of the door, beneath the balance, is 

 seen a second sulphuric-acid absorber, while inside the cupboard beneath 

 the balance case at the extreme right is a broken absorber which gives an 

 idea of the internal construction. The pneumatic elevator with its valve 

 is shown in the middle of the cupboard beneath the balance. 



At the right of the figure is seen the absorber table with the gas-meter 

 used for the residual analysis on the top shelf. The two rubber pipes con- 

 necting the absorber table to the chair calorimeter are shown connected, 

 and beneath them in the rear is the bed calorimeter. At the left are the 

 chair calorimeter and the observer's table with the chair used by the 

 observer. At the extreme left, on the floor, is the balance for weighing the 

 water used to bring away the heat from the calorimeters, and above the 

 chair calorimeter is shown the large balance for weighing the subject. 



In obtaining the photograph from which the figure is made, care was 

 taken to minimize the reflections from the glass of the balance case; hence, 

 the apparatus seen through this glass is substantially as actually installed 

 and is not distorted by reflections. The observer's table is somewhat ele- 

 vated and steps lead to it. The galvanometer is but imperfectly shown at 

 the right of the balance case, immediately above the bed calorimeter and 

 suspended from the ceiling. 



