294 MEASUREMENT OF HIGH TEMPERATURES. ' Ibull. 54. ' 
Taijle 101. — Differential measurement. Apparent viscosity of air at high temperatures. 
| Capillary tubes Nos. 5 and 6. l'+l"'=0. Z"=35.1 C ™. i=35.1<=™ JJ=0.025 cm . Couple No. 37. p=75.3- 
0=4o.l 
P-P 
Vh 
n 
16.7 
48.51 
52.17 
15.1 
40.01 
50.42 
11.5 
48.09 
52.57 
8.9 
48.44 
51.22 
47.14 
48.06 
*"(1+^) 
1/0+47/^2) 
0" 
P 
Xfch/-Rg 

4 
4 
4 
4 
4 
92.1 
90.4 
85.9 
84.3 
0.928 
0. 911 
0.914 
0.946 
0.981 
P-P 
Fh 
r s 
7.9 
51.3 
16.5 
11.0 
50.2 
16. 5 
16.2 
50.7 
16.9 
20.6 
52.0 
16.5 
25.8 
48.4 
38.6 
31.1 
48.6 
16.7 
27.8 
46.2 
^6.4 
23.1 
45.7 
15.4 
19.2 
50.2 
16.9 
14.0 
50.3 
16.0 
9.2 
50.8 
14.6 
1.30 
1.22 
1.15 
1.18 
0.92 
0.99 
0.96 
1.02 
1.03 
1. 10 
1.22 
0" 
P 
454 
83.4 
483 
86.5 
505 
91.7 
531 
96.1 
578 
101.3 
617 
106.6 
620 
103.3 
612 
98.6 
604 
94.7 
594 
89.5 
589 
84.7 
Table l(/2.— Differential measurement. Apparent viscosity of air at high temperatures. 
[Capillary tubes "Nos. 5 and 6. l , +l'"=5 c ' . Z"=30.0 cm . Z=35.0 cm . i2=0.025 cm . p = 76.2. 0=946°]. 
P-p 
Th 
v e 
7j"(l + a0") (1 + 00)4 
>,(l+a0)Tl+tf0") 4 " 
0" 
P 
48.3 
50.54 
42.06 
1.37 
(1200) 
124. 5 
12.0 
51.95 
39.87 
1.48 
88.2 
48.2 
52.59 
44.19 
1.36 
124.4 
11.9 
51.59 
40.26 
1.46 
88.1 
11.8 
51.09 
34.86 
1.66 
(1300) 
I 88.0 
49.3 
51.62 
37.46 
1.57 
125.5 
11.8 
49.79 
35.76 
1.58 
88.0 
51.7 
52.77 
41.36 
1.45 
1160 
127.9 
12.4 
52.69 
38.51 
1.56 
1160 
88.6 
51.7 
50.99 
38.31 
1.51 
1160 
127.9 
51.6 
52.19 
36.29 
1.63 
1280 
127.8 
12.3 
51.87 
34.29 
1.71 
1280 
88.5 
53.0 
52.02 
37.61 
1.57 
1280 
129.2 
(948) 
