192 
MR. H. L. CALLENDAR ON THE PRACTICAL 
General Table of Results. IV.—Observations at fixed points 0 and 100 c . 
A .—In melting ice. 
Resistance 
observed and 
corrected. 
Reduced to 
1 at 0°. 
Temperature. 
Date. 
No. of 
observation. 
5-0845 
1-0000 
o 
o 
o 
Feb.13 
II. 2 
6 2364 
•99983 
(Ice not washed) 
Feb. 23 
III. 3 
6-2374 
1-0000 
(Ice washed) 
Feb. 24 
III. 5 
6-2373 
1*0000 
After long heating 
Feb. 25 
III. 12 
B .—In hypsometer steam. 
Resistance 
observed. 
Reduced to 
1 at 0°. 
Temperature by 
steam. 
Resistance 
calculated (a). 
Date. 
No. of 
observation. 
6-8432 
1-3459 
99-97 
1-3459 
Feb. 13 
II. 3 
8-4013 
1-3470 
100-30 
1-3470 
Feb. 23 
III. 2 
8*4004 
1-3468 
100-18 
1-3467 
Feb. 24 
III. 4 
8-4004 
1-3468 
100-20 
1-3467 
Feb. 25 
III. 6 
9 A.M. 
8-4004 
1 "3468 
100-20 
1-3467 
Feb. 25 
III. 10 
2 p.ji. 
8-3996 
1-3467 
100-19 
1-3467 
Feb. 25 
III. 11 
4 P.M. 
This Table illustrates well the absence of zero error and the constancy of the 
coefficient of increase of resistance. Between observations III. 6 and III. 10 the 
instrument was kept for some time at a red heat. It will also be seen that the two 
different spirals II. and III. agree perfectly in their temperature coefficient. 
Observations at Steady Temperatures 
Table V. 
Number of 
series and 
observation. 
Temperature by 
air thermometer. 
Resistance 
observed and 
reduced. 
Resistance c 
(cl) 
aicuiated by em 
w 
pirical formulas 
(c) 
Resistance 
calculated by 
exponential 
formula (<•). 
I. 3 
49-9 
1-173 
1 173 
1-173 
1 
1174 
1-172 
I. 1 
88-0 
1-304 
1-304 
1-304 
1-304 
1-304 
I. 2 
96 9 
1-335 
1-335 
1-335 
1-335 
1-335 
I. 7 
138-7 
1-480 
1-481 
1-481 
I. 8 
1791 
1-620 
1-620 
1-619 
I. 4 
205-5 
1-707 
1-711 
1-706 
1-708 
I. 5 
210-2 
1-723 
1-727 
1-722 
1-717 
1-724 
III. 9 
266-8 
1-9163 
1-9232 
1-9109 
1-9029 
1-9140 
I. 6 
280-3 
1-960 
1-970 
1-955 
1-947 
1-958 
II. 1 
353"6 (‘f) 
2-1872 
2-2235 
2-1902 
2-1830 
21952 
III. 7 
398-0 
2-3222 
2-3805 
2-3358 
2-3266 
2-3332 
III. 1 
468-9 
2-5472 
2-6224 
2-5479 
2-5452 
2-5488 
III. 8 
579-7 
2-8775 
3-0057 
2"8636 
2-8804 
2 - 8657 
* For correction of these observations, see Appendix, p. 222. 
