PORCELAIN AIR THERMOMETRY. 
Table 46. — Compensator volumetry— Continued. 
195 
; No. 
V 
P- 
vo 
Length. 
Diam. 
Remarks. 
cc. 
cm. Hg. 
cc. 
nil. 
cm. 
2 
0.32 
4.40 
70.02 
28.80 
2. 20 
40 
0.8 
4.50 
28.87 
2.16 
40 
0.8 
0.30 
78.13 
3 
0.85 
4.45 
75.85 
28.44 
1.31 
40 
1.0 
5.44 
24.80 
1.47 
40 
1.0 
0.65 
81.05 
4 
5.20 
L20 
29. 66 
70. 20 
1.20 
40 
1.0 
1.20 
79. 12 
1.21 
40 
1.0 
8.23 
20. 16 
0.30 
53.89 
1.00 
40 
1.0 
New adjustment. 
3.44 
16.28 
3.50 
16.39 
1.11 
40 
1.0 
0.22 
56. 85 
3.54 
31. 37 
1.16 
40 
1.0 
Do. 
0.80 
75. 13 
1.C5 
38.23 
0.55 
Platinum capillary tubes 
and glass stop-cock, with- 
out porcelain stem. 
0.52 
78.55 
2.15 
30.68 
0.52 
0.52 
78.61 
0.13 
76.17 
0.52 
Platinum capillary tubes 
and glass stopcock, wi< h 
out porcelain stem ; new 
adjustment. 
1.82 
21.19 
0.20 
69.54 
0.49 
1.60 
23.03 
3.35 
1.10 
31.85 
75.82 
0.53 
Do. 
The errors in these results are about 0.1 CC , aud they are easily re- 
ferred to microscopic leaks, to variations of temperature, and to the 
possible occurrence of moisture in- the stems. 
From these data it appears, moreover, that the internal volume of 
;tems 0.8 cm thick is not necessarily smaller than the internal volume of 
>tems 1.0 cm thick. Hence the observed differences of volume between 
he divers stems are largely due to internal fissures, such as can not be 
letected, except by breaking the stems. It is interesting to note that 
he volumes measured volumetrically are not more than twice as large 
is those measured by weight calibration. Hence the superior limit of 
he errors in Tables 44 and 45 is not more than double the values there 
jiven. 
Errors of measurement in general. — The degree of absolute accuracy 
v' 
vith which the divers quantities h , H, a, /?, , 
(849) 
, must be measured in 
