the passage of radiant heat through glass screens , 
377 
2 Reflectors, 15 inches distant. 
1 st. Screen 3J inches. 2d. 5 inches from ball. 
No. I. 
!No Screen. 
1 Screen. 
2 Screens. 
Focal 
Focal 
Temp, of 
Focal 
Temp, of 
1 Temp, of 
Therm. 
Therm. 
Screen. 
Therm 
1st Screen. 
2d Screen. 
0 
16.75 
i6. 75 
1 7 -S 
16.5 
18 
17 
3 ° 
20 
17 
20 
16.5 
20 
17 
1 
— 
22.5 
17.25 
21 
16.75 
22 
18 
30 
24.5 
* 7-5 
24 
17 
24 
18 
2 
— 
2575 
1 7-7S 
26 
17 
2 5-5 
18.5 
30 
27 
18. 
27 
>7 
28 
1 8.5 
3 
— 
28 
18. 
28.5 
*7 
29.5 
18.5 
3 ° 
29 
18.25 
29 
>7 
30 
185 
4 
— 
29.25 
18.25 
30 
17 
3 i 
18.5 
3 ° 
29.5 
18.5 
3 * 
17 
3 i -5 
18.75 
5 
“ 
29.75 
18.5 
3 i 
17 
3 2 
18.75 
3 ° 
30 
18.5 
3 1 
«7 
3 2 
18 75 
6 
— 
30 
!8. 5 
3 i 
>7 
3 2 
J 9 
3 ° 
29.75 
18.5 
3 i 
*7 
32 
J 9 
7 
• — 
29.5 
18.5 
3 i 
>7 
3 2 
19 
30 
29.5 
18.5 
3 i 
17 
3 2 
* 9-5 
8 
— 
29 
18.5 
3 i 
17 
3*5 
19.5 
3 ° 
18.5 
30-5 
17 
3 * 
19.5 
9 
— 
18.5 
30 
17 
31 
19.5 
3 o 
18.25 
30 
17 
3 i 
, 95 
10 
— 
18.25 
30 
17 
30.5 
* 9-5 
3<5 
18.25 
2 9-5 
16 75 
30 
19.5 
1 1 
— 
18.25 
29 
16.75 
29.75 
* 9-5 
30 
18.25 
29 
16.75 
29.5 
19.5 
12 
— 
18.25 
28.5 
16.75 
29. 
19.25 
30 
18.25 
28.5 
16.75 
28.75 
19.25 
*3 
• — 
18.25 
28.5 
16.75 
28.5 
19 
30 
18 
28 
16.75 
28.25 
19 
«4 
“ 
18 
28 
16.75 
28 
*9 
