104
18 when the line was in contact with the telephone line between the Observatory and the time-ball tower, on September 1 when the relay acting badly there was no discharge current, on September 7 when the repairs to the relay having been im- properly effected there was an opposing in place of a locking current, and on October 27 on the near approach of a typhoon. The ball was dropped successfully 296 times in 1903. The probable error was in January±0, 14, in February ± 0.10, in March 0.15, in April ± 0.14, in May ± 0.20, in June± 0.13, in July + 0*.09, in August ± 0.09, in September ± 0.14, in October ± 0.09, in November + 0.12, and in December ± 0.09.
Table II.
Errors of Time-Ball in 1903.
means too late.
+ means too early.
Date.
Jan.
Feb. March. April. May.
June.
July. August. Sept. October. Nov.
Dec.
S
S
S
$
$
S
S
S
1
2
3
4
-0.2
6
7
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
0.1
25
0.1
26
+0.2
0.1
27
+0.3
0.1
28
+0.4
0.1
29
...
30
31
+0.6 +0.4
182 1833333 1833333 1888888
+0.2
+0.3
0.1
+0.5
+0.2
0.1
+0.4
0.1
0.1 +0.3
-0.2
0.1
+0.5
0.1
0.1 +0.6
0.1 +0.2
0.1
+0.2
0.1
+0.3
0.1
0.1
22222: 222; 22: 222222:
0.1
0.1
0.1
+0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
1388388 1888888 1333232 133
0.1
0.1
0.1
+0.2
0.1
0.1
-0.4
0.1
0.1
0.1
0.1
+0.3
+0.4
+0.2
0.1
+0.2
1888 1888888 :
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
888
0.1
0.1
0.1
0.1
0.1
+0.2
+0.8
+0.5
+0.6 +0.2
0.1
0.1
0.1
0.1
0.1
0.1
+1.1 +1.5
0.1
0.1
0.1 +0.2
0.1
+0.2
+0.2
0.1 +0.2
0.1
3832 1883838 18 1838 : 1833332 132858
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
0.1
0.1
+0.2
-0.2
1 +0.3
+9.3
0.1
+0.4
0.1
+0.6
0.1
0.1
+0.4
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
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-888 1883868 1833333 1333333 18,13333 1883888 : 188888 1888888 1883383 12:
S
ន
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
0.1
0.1
...
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.3
+0.6
61
0.1
0.1
0.1
0.1
0.1
-0.2
0.1 0.1
0.1
0.1
16. The cisterns of the barograph and standard barometers are placed 109 feet above M.S.L. The bulbs of the thermometers are rotated 108 feet above M.S.L., and 4 feet above the grass. The solar radiation thermometer is placed at the same height. The rim of the rain-gauge is 105 feet above M.S.L., and 21 inches above the ground.
17. The monthly Weather Reports are arranged as follows:
Table I. exhibits the hourly readings of the barometer reduced to freezing point of water, but not to sea level nor for gravity, as measured (at two minutes to the hour named) from the barograms.
Tables II. and III. exhibit the temperature of the air and of evaporation as determined by aid of rotating thermometers. Table II. exhibits also the extreme temperatures reduced to rotating thermometer by comparisons of thermometers hung beside them. Table III. exhibits also the solar radiation (black bulb in vacuo) maximum temper- atures reduced to Kew arbitrary standard.