KNOBLAUCH ON RADIANT HEAT. 



411 



Table XXXIX. 



insertion when the rays of the Argand lamp are reflected by 



Also on inserting the other diathermanous bodies, no differences 

 were observed. Neither can the rays of the Argand lamp, re- 

 flected by white and black silk, light and black cloth, yellow 

 leather and brown Spanish leather, white and red wool, and cin- 

 nabar and peroxide of copper, be distinguished from each other 

 by means of any one of the above substances. 



The values observed with the heat of the red-hot platinum, on 

 the repetition of these experiments, are arranged in the following 

 table :— 



Table XL. 



insertion when the heat of the red-hot platimcm is reflected by 



12°'37. The same occurs with blue glass, alum, rock salt and 

 gypsum. The other surfaces arranged in the table, in the case 

 of each and the same pair, also reflect the heat of the red-hot 

 platinum in such a manner that it permeates the diathermanous 

 bodies in the same proportion. 



Under the influence of the rays of the flame of alcohol, as 

 shown by the following observations, this agreement also ob- 

 tains : — 



other. 



lio iimiibcr.s separated by the thicker lines arc not coiiiparahlp willi each 



