220 
MEASUREMENT OF HIGH TEMPERATURES. 
Tablk61. — Comparison of air thermometer and thermo-couple. Series IV. Method i 
constant pressure. 
Re-entrant bulb No. 1. vu 
= 280. t 
=15. 7°. 
Thermo-couple No. 37. 
F, 
^i 
Bo 
T 
Time. 
t 
620 
Time. 
Gas- 
cock. 
cc. 
°G. 
cm. 
°C. 
Jiours. 
°C. 
microvolt 
hours. 
139.2 
23.5 
75.57 
288 
1.20 
21.6 
2480 
1.18 
2 
149.3 
23.6 
75. 57 
330 
• 1. 30 " 
21.6 
2952 
1.27 
2 
157.0 
24.0 
75.57 
364 
1.48 
21.8 
3376 
1.42 
2 
158.6 
24.0 
75.57 
372 
1.55 
22.0 
3579 
1.52 
2 
161. G 
24.1 
75.57 
387 
1.75 
22.4 
3781 
1.68 
2 
162. 1 
24. 1 
75. 7 
390 
1.82 
22.6 
3836 
1.77 
2 
173.5 
24.5 
75. 55 
455 
2.02 
23.0 
4295 
1.97 
2.5 
179.4 
24.7 
75.55 
494 
2.12 
23.2 
4961 
2.03 
2.5 
184.5 
24.7 
75. 55 
532 
2.28 
23*6 
5602 
2.27 
2.5 
186.0 
24.8 
75. 55 
543 
2.43 
23.7 
5729 
2.35 
2.5 
194.3 
24.9 
75.58 
616 
2.62 
24.4 
6418 
2.57 
2.7 
197.0 
25.1 
75. 58 
641 
2.68 
24.6 
7386 
2.73 
2.7 
202. 
25.2 
75.58 
693 
2.97 
24.8 
7783 
2.90 
2.7 
203.0 
25.3. 
75. 58 
704 
3.07 
25.1 
8001 
3.02 
2.7 
208.5 
25.5 
75. 59 
770 
3.32 
25.6 
8761 
3.27 
3.0 
210.8 
25.6 
75.59 
801 
3.47 
25.8 
9277 
3.40 
3.0 
212.4 
25.9 
75.59 
819 
3.67 
26.1 
9691 
3.62 
3.0 
215.2 
26.0 
75.61 
801 
3.87 
26.6 
10193 
3.83 
3.3 
216. 4 
26.2 
75.61 
879 
3.98 
26.7 
10490 
3.93 
3.3 
218.8 
26.4 
75.61 
914 
4.13 
27.1 
11023 
4.10 
3.5 
219.7 
2G.4 
75.61 
930 
4.22 
27.2 
11366 
4.18 
3.5 
220.9 
26.5 
75. 61 
950 
4.38 
27.4 
11675 
4.32 
3.5 
221.2 
26.5 
75.61 
956 
4.48 
27.6 
11803 
4.43 
3.5 
221. 5 
26.9 
75.61 
957 
4.70 
27.1 
11869 
4.67 
3.5 
215.7 
26.4 
75.68 
868 
4.84 
28.2 
11589 
4.76 
210.1 
26.1 
75.68 
790 
4.97 
28.4 
9998 
4.90 
205.1 
25.8 
75.68 
729 
5.07 
28.5 
8801 
5.02 
200.1 
25.4 
75.68 
675 
5.17 
28.6 
8146 
5.10 
194.9 
25.5 
75. 68 
621 
5. 28 
28.6 
7329 
5.22 
sri 
190.0 
25.4 
75.68 
577 
5.40 
28.6 
6108 
5.45 
184.4 
25.5 
75.73 
525 
5.55 
28.6 
5501 
5.59 
180.0 
25.5 
75.73 
500 
5. 65 
28.6 
5003 
5.73 
163. 8 
24.2 
75. 73 
402 
6.03 
28.4 
3826 
6.12 
155.2 
23.9 
75.73 
359 
6.25 
28.2 
3460 
6.28 
i 
Tables 62 to 66, exhibit the five series of observations classified as 
Group II. The last of these series (No. V) contains data for the meas- 
urement of the coefficient of expansion of the porcelain bulb. The! 
method by which such data may be utilized is explained below oil 
page 236. 
(874) 
