224 
Table 66. 
MEASUREMENT OF HIGH TEMPERATURES. 
■Comparison of air thermometer and thermo-couple, 
constant pressure — Continued. 
Ser 
[BULL, i 
V. Method 
Re-entrant bulb No. 2. v ( 
= 279. 
£ = 10°. 
Th 
srmo-coupl 
e No. 38. 
"F, 
T, 
Bt 
T 
Time. 
T 
ew 
Time. 
Gas 
cock. 
cc. 
°a 
cm. 
°C 
hours. 
o(7. 
microvolt. 
hours. 
225.0 
24.3 
75.54 
935 
3.53 
25.4 
12439 
3.45 
1 
219.6 
23?7 
75.54 
852 
3.64 
25.6 
10991 
3.57 
215.1 
23.5 
75. 54 
790 
3.73 
25.8 
9893 
3.66 
209.6 
23.3 
75.54 
722 
3.84 
25.8 
8991 
3.75 
205.0 
23. C 
75. 56 
671 
3.94 
25.8 
8126 
3.86 
200.0 
22.7 
75.56 
622 
4.06 
25.8 
7309 
3.98 
o 
> to 
195.1 
22.3 
75.56 
579 
4.18 
25.8 
6642 
4.10 
190.1 
22.0 
75.56 
539 
4.31 
25.6 
6085 
4.23 
O 
184.9 
21.6 
75.57 
501 
4.42 
25.0 
5480 
4.37 
179.9 
21.2 
75.57 
467 
4.53 
25.4 
5096 
4.47 
175. 
21.2 
75.57 
. 436 
4.66 
25.3 
4763 
4.56 
170.0 
21.5 
75.54 
405 
4.78 
25.2 
25.1 
4382 
4134 
4.68 
4.77 
) 
The results of these tables were constructed graphically by reprr 
senting on the same sheet Tand e^ respectively, as functions of timit 
For the pairs of curves thus obtained it is easy to select data for th u 
construction of e 2 o as a function of T with a degree of accuracy consiss 
eut with the accuracy of measurement. Such data are enumerated i 
Tables 67 to 70, which correspond, respectively, to the four tables jufc 
described. 
It is perhaps well to remark that generally the interpolations art 
made linearly. This involves less assumption and less work thai 
other graphic methods, and the points are sufficiently near together ti 
make it available. 
Tables 67 to 70 correspond to the data of Group I, Tables 58 to 6T»| 
Table 67. — Corresponding to Table 58. 
Series 
I.— Re-entrant bulb No. 1 
No. 
T 
020 
No. ! T 
030 
37 
370 
3530 
37 
780 
8950 
37 
390 
3810 
37 
800 
9200 
37 
400 
3940 
37 
820 
9470 
37 
410 
4050 
37 
840 
9770 
37 
420 
4170 
37 
850 
9940 
- 
37 
860 
10100 
(878) 
