SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. DO 



COi and water cooler 01 



In a crowded room the air confined between the bodies and clothes 

 of the people is warmed almost up to body temperature and saturated 

 with moisture, so that cooling of the body by radiation, convection 

 by evaporation, becomes almost impossible. This leads to sweating, 

 wetness and flushing of the skin, and a rise of skin temperature. 

 The blood is sent to the skin and stagnates there instead of passing 

 in ample volume through the brain and viscera. Hence arise the 

 feelings of discomfort and fatigue. The fans in our chamber whirled 

 away the blanket of stationary wet air around the bodies of the 

 students, and brought to them the somewhat cooler and drier air in 

 the rest of the chamber, and so relieved the heat stagnation from 

 which they suffered. The relief became far greater when we 

 allowed cold water to circulate through a radiator placed in the 

 chamber, and so cooled the air of the chamber about io° F. The 

 discomfort of crowded rooms and overwarm places of business can 



