288 
MEASUREMENT OF HIGH TEMPERATURES. 
[bull. 54. 
Table 94. — Transpiration of air under variable pressure. {Chimneyed burner.} 
[Platinum capillary tubo No. 1. £ = 37 cm . Z = 4 cm . J R = 0.0272 cm . 7" =:58a cc .] 
Time. 
Initial 
pressure. 
Final 
pressure. 
Barome- 
ter. 
Temperature. 
79 
249 
79 
252 
145 
590 
145 
597 
1 
[> 118 
!> 99 
1 
J 
112 
91 
f 
1 
78 < 
1 
I 
f 
78 <| 
1 
18°. 
Bright red heat. 
18°. 
Bright red heat. 
18°. 
Bright red heat. 
18°. 
Bright red heat. 
Table 95. — Transpiration of air under variable pressur 
[£=37' m . &=4 em . .£=0.0272™. 0=5°. F =580 r '.] 
Time. 
Initial 
pressure. 
Final 
pressure. 
Barome- 
ter. 
Temperature. 
73 
] 
r 
15°. 
244 
I 
Bright red heat. 
74 
} 120 
114 
77 <[ 
15° 
242 
! 
Bright red heat. 
74 
J 
I 
15°. 
92 
i 
r 
15o. 
313 
1 
| 
Bright red heat. 
92 
> in 
104 
77 < 
15°. 
319 
1 
| 
Bright red heat. 
92 
j 
I 
16°. 
125 
i 
f 
16°. 
487 
1 
| 
Bright red heat. 
125 
J> 101 
94 
77 < 
16°. 
478 
1 
Bright red heat. 
125 
j 
16°. 
195 
1 
r 
16°. 
900 
900 
1 
)■ .92 
1 
84 
77 \ 
1 
Bright red heat. 
Bright red beat. 
196 
J 
I 
16°. 
Transpiration under constant pressure P—p. — The following tables, 96 
to 100, contain the results of precise experiments. As before, P and p 
are the pressures at the two ends of the platinum capillary, respect- 
ively; 6" the temperature of its hot parts L— (V+V"), and 6 the tem- 
perature of its cold parts. Fis the zero- volume of air transpiring 
through the capillaries in the time t". E is the radius of the capillary 
and r the actual temperature of the air in the receiver B (Fig. 43), from, 
(942) 
