212 
MR. H. L. CALLENDAR ON THE PRACTICAL 
Table A.-iv. —Comparison of Platinum and Air Thermometers—( continued ). 
Resistances 
H,S0 4 
Mercury 
Barometer 
and 
Auxiliary 
observed. 
gauge. 
manometer. 
° 2 
Time. 
thermo- 
attached 
Results. 
-G > 
meters. 
Spiral. 
Connec¬ 
tion. 
X 
M b 
thermo¬ 
meter. 
2 o 
£ -c 
^ o 
Ads'. 12 
A. 18-8 
21-702 
2-60 
55-66 
19-06 
30-016" 
67-4° F. 
pt = 18 02° C. 
10.2 
R. 17-6 
21-704 
1130 
3-80 
56-12 
19-33 
(13) 
t = 17-79° C. 
10.10 
M. 20-0 
21-707 
2-80 
55-76 
1915 
mlc --- 8” 741 
11.10 
R. 18-0 
20-460 
2'55 
59-11 
20-13 
30-010" 
11.17 
A. 19-6 
20-458 
1-076 
2-18 
59-10 
20-18 
68-7° F. 
In Ice. 
11.22 
11.30 
A. 19-9 
R. 18-3 
20-456 
20-455 
313 
3-00 
61-57 
61-56 
22-50 
22-52 
(14) 
R 0 =19-945 B. A. 
11.36 
M. 2P0 
20-454 
2-33 
6315 
24-19 
30-008" 
mh = 8 ”743 
12.3 
M. 20-0 
20-453 
1-076 
2-75 
63-18 
24-19 
69-3° F. 
5.25 
A. 19-5 
27-347 
3-05 
52-94 
27-62 
29-920" 
5.27 
R. 193 
27-348 
2-60 
54-39 
29-15 
66-0° F. 
In Steam. 
5.35 
M. 19'9 
27-349 
1-397 
6-45 
53-50 
27-58 
(15) 
5.40 
A. 20-0 
27-348 
. . 
1-90 
52-12 
27-03 
29-918" 
RfiRo = 13391 
5.42 
R. 19-5 
27-348 
1-396 
4-50 
52-89 
27-32 
65-8° F. 
mh = 8” 740 
5.47 
M. 20T 
27-348 
2-00 
5211 
27-01 
About the middle of February, 1887, the whole apparatus was thoroughly revised, 
improved in several minor details, and set up afresh. The gauge had meanwhile been 
mended and improved. A slight error in the position of one of the comparison 
electrodes was rectified, and the spiral made more uniform by cutting off a short 
portion and refixing : it was partially re-arranged by means of a wire introduced 
through the open end. 
In mending the gauge, the tube DG had been made of larger bore ('0127 c.c. per cm.), 
so that it was necessary to affix a scale S and record the reading x. The bore of 
the new gauge tube was - 0232 c.c. per cm. instead of '0407, as in Series IV., and 
the scale read 2'30 when the pressure was the same on both limbs of the gauge. In 
Series IV. it had been adjusted to read zero, but it was not considered worth while to 
adjust it afresh. A new legal ohm-box was used to measure the resistance in place 
of the B. A. box used in Series IV. The observations in the following Table (A.-v.) 
were then taken in the order in which they are given :— 
