KNOBLAUCH ON RADIANT HEAT. 



395 



Table XXV. 



the needle from 25° to 17°*44 occurred ; in the second, from 25° 

 to 21°-31. 



The following table contains the observations which were 

 obtained on the transmission of the heat reflected by different 

 white bodies through the diathermanous media used for testing 

 them. On comparing it with the unreflected, it is evident that 

 all except that which is reflected by silver having a "dead" polish 

 can be distinguished by means of transmission from the direct : — 



Table XXVI. 



after the insertion when the heat of the Argand lamp is reflected by 



black paper, which caused a direct deflection of 13° in the needle, 

 on introducing the red glass, produced a deflection of S°-03 ; 



