the radiant heating effects from terrestrial sources, 193 
(is.) Argand lamp without its chimney. Distance 3 inches. 
Glass screen. 
Experiment. 
n 
Rise of Thermometers in 
I min. centigradge. 
A. White. 
B. Black. 
1 
• 75 
1-75 
2 
.5 
2.25 
3 
.75 
2.25 
Mean 
.66 
2.08 
Allowing for the screen. .41 
1.83 
No Screen. 
1 
2 
3 
1.75 
1.75 
2 . 
3.5 
3.25 
3.5 
Mean 
1.83 
3.41 
Difference of exposed ) 
and screened results, j 
1.58 
MDCCCXXV. 
Cc 
