90
Table II.
Errors of Time-Ball in 1905.
means too late.
+means too early.
Date.
Jan.
Feb.
Mar. April. May. | June. July. Aug. Sept. | Oct.
Nov.
Dec.
S.
5.
5.
S.
S.
S.
S.
1
+0.6
0.1 -0.3
2
+0.9
+0.2
0.1 +0.2
-0.3 | −0.5
0.1
S. 0.1 0.1
S.
S.
8.
3
+1.1
+0.2 -0.3
+0.3 0.1
0.1 +0.2
.0.2
+0.2 -0.3
+0.4
0.1 0.1 0.1
0.1
-0.2 +0.6
0.1
6
0.1
+0.4
0.1
+0.7
0.1
-0.2
+0.2 | +2.6 | +0,5·
-0.6
0.1
-0.2
+2.8 +0.6
-0.6
0.1
+0.2
0.1
-0.2
9
+0.2
+3.0 | +0.7
0.1
+0.5
0.1
10
+0.3
+3.4 | +0.8 -0.9
0.1
+0.5
+0.2
0.1
11
0.1
+3.8
+0.9 | -0.6
0.1
+0.2 | +0.2
12
0.1
-0.7
0.1
0.1 +0.3
13
0.1
-0.3 -0.2 -0.6
0.1 0.1
-0.2
14
+0.2
0.1 | −0.4 | -0.6
0.1 -0.3
15
0.1 0.1 Π.Ι.
16
+0.3
0.1
0.1
17
+0.3
0.1 | +0.2
18
+ 0.4
0.1
+0.5 +0.3 0.1.
19
+0.4
+0.4
20
+0.4
0.1
+0.6
21
0.1
0.1 +1.2
22
-0.2+1.5
23
0.1
-0.5 +1.7
24
0.1
-0.5 +2.0
25
0.1 +0.5 +2.2 -0.3
26
0.1
-0.2
27
0.1 +0.7
1333333 192 1232
0.1
0.1
+0.2
0.1
0.1
...
+0.2
32338 1333888
+0.2 0.1
0.1 +0.2 0.1 0.1
+0.3 0.1
+0.5 0.1 0.1
0.1 -0.2 0.1 0.1
0.1
0.1 0.1
+0.2 0.1 0.1
0.1
0.1 0.1
-0.2-0.2
0.1 +0.2
| 438:33333 ::
0.1
0.1
0.1
0.1
0.1 +0.2
...
0.1
0.1
0.1
+0.2
0.1 +0.2 0.1
0.1 +0.3
0.1 +0.5
0.1-0.2
0.1 +0.7
0.1
0.1 +0.3
0.1
0.1
0.1 +0.4
0.1
0.1!
0.1 0.1
0.1
0.1 +0.5
0.1 0.1
0.1
0.1
0.1 +0.2 +0.2 +0.3
0.1
+0.2
0.1
0.1
+
0.1
-0.2
-0.2 +0.2
0.1
0.2 +0.3 +0.3 -0.2
0.1
! +0.4
0.1
0.1
+0.5 +0.6
-
-0.3 -0.2
+0.2 +0.2
0.1
0.1
+0.2 +0.4
0.1
0.1
0.1
0.1 0.1 +0.2
0.1
...
28
0.1 0.1
29
30
+0.3
31
+0.4
-0.5 0.1 -0.4 -0.3 -0.3
0.1 0.1 | +0.5 0.1 0.1 0.1 +0.7
-0.2
+0.9
0.1 0.1
0.1
0.1 -0.2 -0.4 +1.1 +.3 +0.2
-0.2 -0.3 -0.3
33333
0.1
0.1
0.1
0.1
0.1 0.1
0.1
0.1
0.1
0.1
0.1
0.1 0.1 +0.2 *0.1
11. The hygrometric tables generally used for calculating the Vapour tension and Dew point from observations of the. Dry and Damp thermometers mounted in screens, are not quite suit ble when the air temperature and temperature of evaporation are determined by means of hotating thermometers.
With a view of calculating hygrometric tables adapted for use with the latter instruments, observations with Alluard's hygrometer and rotating thermometers have, at the instance of the Royal Society, been in progress here for some years whenever opportunity offered.
These obsetations have been made for the most part in the magnetic observing hut, a wooden building 16 feet by 12 feet. This building is provided with a door on the North and South sides end with two windows each on the East and West sides. In addition to the ordinary glass windows, louvres are fitted, and the latter have been found very convenient for permitting the amount of air motion through the building to be regulated to a great extent. Almost invariably the South door has been kept shut to avoid sunshine falling on the floor of the building and radiation from the ground outside, and the North door left open. The windows have also been kept open and the louvres closed, the slats being so regulated, according to the direction and force of the wind, as to permit of a free current of air passing through the building. By this arrangement also, direct light comes chiefly from the North, which is an advantage as strong light from all directions renders the observations very difficult. Partly owing to this cause observations made in the open air and in other situations bave had to be rejected, as the results were so discordant as to make it doubtful whether the deposit of dew had been properly observed. Besides in the open air the vari- able air motion and radiation from the ground render the observations most uusatisfactory-- the Alluard responding quickly to changes of dew point so caused, while the effect was often unnoticeable on the rotating therinometers.
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