NO. 6 BODY RADIATION ALDRICH I9 



These results confirm the preceding conchision that the meHkeron 

 computed temperatures are in error by just as much as the water 

 jacket differs in temperature from the wall. Summarizing the above 

 evidence, it appears that when the Room T. minus the Water J. T. 

 is zero, the Melikeron and Thermoelement temperatures on clothing, 

 hair, shoes, and calorimeter agree with each other within °i. On the 

 skin, however, when the Room T. minus the Water J. T. is zero the 

 melikeron computed temperatures are approximately i?i greater than 

 the thermoelement temperatures. Dr. Abbot's skin measurements of 

 1921 at Boston (see table A) give evidence of the same thing — that 

 on the skin the melikeron computed temperatures are higher than 

 those measured directly with the thermoelement. A mean of 53 of his 

 values in table A gives 



Melikeron minus Thermoelement = i°9 



As an explanation for the persistently larger melikeron temperatures 

 on the skin, Dr. Abbot suggests that since the skin is porous and the 

 internal temperature of the body is higher than that of the surface, the 

 melikeron sees into a deeper layer than that reached by the thermo- 

 element. 



EXPERIMENTS ON TEN SUBJECTS IN STILL 

 AND IN MOVING AIR 



A second series of experiments on human subjects was begun on 

 May 30, 1928. It included 8 children of school age and 2 adults. 

 Three similar sets of observations were taken on each subject, first 

 in still air, second with moderate air motion, and third with faster air 

 motion. As before, the air motion was produced by an electric fan 

 three meters away, the motor of which ran on storage batteries. Air 

 velocities wefe again measured with the Hill Katathermometer. Each 

 subject was placed inside the same curtained room described under 

 the calorimeter experiments. Skin, clothing and wall temperatures 

 were measured with the thermoelement device. Exactly the same 

 body and wall positions were measured on each subject. A complete 

 set included 7 observations on the exposed skin, 15 on the clothing, 

 I on the hair, 2 on the shoes, and 10 on the walls. The skin tempera- 

 tures were then corrected to the melikeron scale by increasing the 

 thermoelement skin temperatures i°i as explained in the previous 

 section. The observations were grouped and summarized as shown 

 in table E. Following exactly the method described on page 13, 

 Stefan's 4th power formula was applied to the various groups and 

 values of the total radiation determined as g^iven in table E. 



