94 Inquiry concerning the Nature of Heat, 



And if of the total quantity of heat which passed off 

 through the bottom of the conical instrument No. 6, = 

 9954, a quantity = 9597 passed off through the air in 

 calorific rays, the remainder only (9954 959?), which 

 amounts to no more than 357 parts, could have been 

 communicated to the air. 



Hence it would appear that when a hot body is 

 cooled in air ^ T part only of the heat which it loses is 

 acquired by the air; for 357 is to 9597 as i to 27, very 

 nearly. But I shall refrain from enlarging farther on 

 this subject at present. 



One of the objects which I had in view in the last ex- 

 periment was to find out whether the cooling of a hot 

 body in air is or is not sensibly accelerated or retarded 

 by the greater or lesser distance at which the body is 

 placed from other neighbouring solid bodies, when these 

 neighbouring bodies are at the same temperature as the 

 air ; and, as a comparison of the result of this experi- 

 ment with the results of the two preceding experiments 

 so strongly indicated that the cooling of the conical ves- 

 sel in the preceding experiments had in fact been re- 

 tarded by the vicinity of the pewter platter over which it 

 was suspended, I was now induced to repeat these ex- 

 periments with some variations. 



These investigations appeared to me to be of the 

 more importance, as I conceived that the results of them 

 might lead to a discovery of one of the causes of the 

 warmth of clothing. 



Experiment No. 32. I now placed the pewter platters 

 once more in their former stations, perpendicularly under 

 the bottoms of the two conical vessels, but at the dis- 

 tance of 3 inches only ; that which was under the vessel 

 No. 5 being at the temperature of the air of the room 



