The probable error of the Time Ball was +0.14; the monthly values for the past 5 years are given below:—
Probable Error of Time Ball.
Month. 1914 1915 1916 1917 1918 January, +0.18 ±0.17 ±0.15 ±0.17 +0.11 February, -0.15 '44 '28 '13 March, '21 '17 '17 'I I '15 April, '22 '38 '18 '18 '10 May, '25 '16 '10 '17 '12 June, '16 '15 '17 '10 '14 July.. '20 '17 '10 '21 'I I August, '21 '15 '10 'I I '26 September, '14 '13 'I I '10 '16 October, '14 '10 '13 '10 November, '13 '16 '13 '10 '12 December, '28 '14 'I I '10 '14 Means, +0.19 ±0.19 ±0.14 +0.13 +0.14Transit Instrument.---Observations for time were made daily with the 3-inch transit and the Hipp tape chronograph by the Chinese computers, weather permitting.
The number of observations in the years 1917 and 1918 were as follows:
1917. 1918. Transits, 1,924 1,522 Level determination, 952 787 Azimuth 44 23 Collimation 40 22No transits of the sun were utilized during 1918.
The azimuth and collimation determinations were made by the Director and Chief Assistant. The azimuth determinations depend usually upon observations of the old south mark.
Clocks. Early in January the clocks were removed from their piers and the piers demolished, in order to relieve the congestion in the clock room and to facilitate entrance to the extended battery room. The Standard Sidereal and the Brock Mean Time clocks were placed on the west wall 9 feet apart, and the Dent Mean Time clock on the north wall, 3 feet from the NW corner of the room.
The losing rate of the Sidereal Standard clock Dent No. 39741 varied from 0.00 on February 14th (Bar. 30.13, Temp. 61°.6) to -0.57 on August 15 (Bar. 29.35, Temp. 81°.2) and October 5 (Bar. 29.72, Temp. 79°.1). The clock was stopped by an earthquake on February 13 and tripped 18 seconds between
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The probable error of the Time Ball was + 014; the monthly values for the past 5 years are given below :—
Probable Error of Time Ball.
Month.
1914
1915
1916
1917
1918
January,
018 ±0.17
±0.15
±0.17
+011
February,
*15
'44
*28
13
March,
*21
17
*17
'I I
15
April,
*22
*38
*18
*18
*10
May,
'25
16
'10
17
*12
June,
16
15
17
'10
14
July..
*20
*17
'10
'21
'I I
August,
*21
*15
ΤΟ
*I I
·26
September,
'14
13
'I I
'10
16
October,
·
*14
*10
13
'10
12
November,
13
*16
*13
[O
'IZ
December,
*28
14
'I I
'10
14
Means,
+0.19 ±0.19
±0.14 +0.13 +0.14
Transit Instrument.---Observations for time were made daily with the 3 inch transit and the Hipp tape chronograph by the Chinese computers, weather permitting.
The number of observations in the years 1917 and 1918 were as follows:
Transits,
...
Level determination,
Azimuth
"
...
Collimation
...
""
1917. 1918.
1,924 1,522
952 787
44
23
40
22
No transits of the sun were utilized during 1918.
The azimuth and collimation determinations were made by the Director and Chief Assistant. The azimuth determinations depend usually upon observations of the old south mark.
―
Clocks. Early in January the clocks were removed from their piers and the piers demolished, in order to relieve the conges- tion in the clock room and to facilitate entrance to the extended battery room, The Standard Sidereal and the Brock Mean Time clocks were placed on the west wall 9 feet apart, and the Dent Mean Time clock on the north wall, 3 feet from the NW corner of the room.
•
The losing rate of the Sidereal Standard clock Dent No. 39741 varied from 000 on February 14th (Bar. 3013, Temp. 61°6) to-057 on August 15 (Bar. 29ins 35, Temp. 81° 2) and October 5 (Bar. 29ina. 72, Temp. 79°1). The clock was stopped by an earthquake on February 13 and tripped 18 seconds between
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