Fig. 4 



General view of laboratory taken near the temperature recorder. The bed calorimeter is at the right, 

 the absorber table in the immediate foreground, back of it the chair calorimeter and observer's table, and at 

 the left the balance for weighing absorbers. Near the ceiling are shown the ducts for the cold air used for 

 temperature control. 



\ 



Fig. 5 



View of laboratory taken from the entrance of the bed calorimeter, with balance for weighing oxygen 

 cylinders at the left. The structural steel skeleton of the calorimeter for long experiments is at the right and 

 sections of the copper lining are in the rear, resting against the wall. 



