72 MEASUREMENT OF HIGH TEMPERATURES. 
Table 3. — Constancy of temperature in earlier forms of the zinc boiling-point apparatus. 
Date. 
Dec. 
28, 1883 
Jan. 
10, 1884 
Jan. 
11, 1884 
Jan. 
15, 1884 
Jan. 
29, 1884 
Jan. 
30, 1884 
Feb. 
2, 1884 
Feb. 
4, 1884 
Apparatus. 
Retort 
do 
Iron boiliug-point apparatus 
Retort wi th condenser 
Graphite boiling-point apparatus. 
do 
.CIO 
do 
Kg. of Zn. 
distilled : 
charge. 
No. of 
thermo- 
couple. 
020. 
14 
9150 
14 
9600 
14 
9630 
14 
9390 
18 
9216 
18 
9184 
18 
9191 
18 
(9281) 
847 
880 
883 
867* 
860 
856 
857 
865 
914 
950 
953 
934 
924 
921 
922 
930 
It is to be borne in mind that the above data have a relative signifi- 
cance only. Their absolute values can not be discussed before Chapter 
IV. The same thermal and electric scales are uniformly used through- 
out Chapters I and II. 
In Table 4 data showing the progressive stages of temperature of 
the zinc crucible are given in time series. The plan is identical with 
that of the preceding table, h denotes the number of hours elapsed- 
from the beginnin g to the end of the ebullition. 
Table 4. — Constancy of temperature in earlier forms of the sine boiling-point apparatus; 
time series. 
Date. 
Time. 
h. 
No. of 
thermo- 
couple. 
020., 
T.. 
y«. 
Remarks. • 
Jan. 29,1881 
h. m. 
4 25 
0.00 
18 
9220 
860 
925 
Charge insufficient. 
32 
0.12 
18 
9180 
857 
921 
37 
0.20 
18 
9170 
850 
920 
48 
0.38 
18 
9020 
846 
910 
55 
0.50 
18 
8580 
815 
872 
Furnace cools. 
Jan. 30,1884 
2 35 
0.00 
18 
6500 
658 
693 
Approaching ebullition. 
45 
0.17 
18 
7510 
736 
682 
3 00 
0.42 
18 
8920 
840 
900 
20 
0.75 
18 
7800 
750 
807 
Blower stopped by acci- 
• dent. 
35 
1.00 
18 
8150 
781 
836 
40 
1.08 
18 
8910 
839 
899 
Approaching ebullition. 
45 
1.17 
18 
9150 
854 
919 
50 
1. 25 
18 
9180 
850 
920 
Ebullition. 
55 
1.33 
18 
9180 
856 
920 
4 10 
1. 55 
18 
9260 
804 
928 
15 
1.67 
18 
9200 
864 
928 
30 
1.92 
18 
9300 
867 
933 
40 
2.08 
18 
9370 
870 
938 
Charge distilled. 
50 
2.25 
18 
9610 
886 
956 
5 00 
2. 42 
18 
9770 
80S 
970 
Superheating. 
10 
2.58 
18 
9680 
890 
961 
15 
2. 67 
18 
9540 
882 
951 
Furnace cools. 
25 
2.83 
18 
9220 
860 
924 
(72G) 
