This, in about 8 or 10 mU 

 nutes, gave 61 degrees, for 

 tlic rifitip; produced in niy 

 •tberniouieler by the red 

 rays, compared to the two 

 ftandard theruiqineters. 



2d Experiment. As foon as my thermometer was reflored 

 to the temperature of the room, which I haftencd, by ap- 

 plying it to a large piece cf metal that had been kept in the 

 fame place, I cxpofcd it again to the red rays, and ngiftered 

 its march, along with No. 2 as a ftandard, which was as 



Hence, in 10 minutes, the red ray5 

 ■ made the thermometer rife 7 de- 

 grees. . 



^d I^xperhnent. Proceedjiig in the fame mariner as before, 

 in the green rays I h;j.d, 

 No. 1. ' No. 2.' 



43 



45'r 



46 



45 



46 



43 

 43 



43 



43.1 



43:- 



Therefore, in 10 minutes, the green 

 rays occafioncd a rife of 3;- de- 

 erecs. 



4//; E.rpcrinieni. I now expofed my thermometer to thcf 

 violet rays, and conipare4 it with No. 2. 



No. I. 

 44 

 44 

 44f 

 45 



No. 2. 

 44 

 44 

 431- 

 43 



Here we have a ri^fing of 2 degrees 

 in 10 minutes, for the violet 



ras'S. 



5/;& Experl'inent. J, now expofed Dr. Wilfon's thermo- 

 meter Np. 2 to the r^d rays, and compared its progrels witl^ 

 No. 3 



44 I I;Iere the thermometer, expofed to 

 44 V red, rofe. in five minutes 2i dc.» 

 43 r j grcei. 



■JsTo. 2. 

 44 ' 



4^1- 



43 i 



