THE HONGKONG GOVERNMENT GAZETTE, 31ST MARCH, 1888.
GOVERNMENT NOTIFICATION.-No. 135.
321
The following Report from the Director of the Observatory is published for general information,
By Command,
Colonial Secretary's Office, Hongkong, 31st March, 1888.
FREDERICK STEWART, Colonial Secretary.
HONGKONG OBSERVATORY.
Magnetic Observations made during the year 1887.
The observations of Declination and Horizontal Force were made with the Unifilar Magnetometer, Elliott Brothers No. 55, and the Dips were observed with Dip-circle, Dover No. 71.
The methods adopted in making the observations and in determining and applying the corrections are explained in Appendix G. of Obs. and Res. made in 1885: "On the verification of the Unifilar Magnetometer Elliott Brothers, No. 55." The value of log. 'K was 3.44959, at 20° Cent. and the value of P was + 8.819. The mean value of the magnetic moment of the vibrating needle was 0.48980 in English Units and 639.47 in C.G.S. Units.
The times of vibration exhibited in the table are each derived from 12 observations of the time occupied by the magnet in making 100 vibrations, corrections having been applied for rate of chrono- meter and arc of vibration.
The observations of Horizontal Force are expressed in C.G.S. Units (one centimeter, one gramme, one second) but the monthly synopsis exhibits X, the Horizontal, as well as Y, the Vertical, and the Total Forces, which have been computed by aid of the observed Dips, and their values are also given in English Units (one foot, one grain, one second) and in Gauss's Units (one millimeter, one milligramme, one second).
་
The mean of the observations made during the past four years give for the 1st January 1886 the following mean values for the different elements: Declination (East) = 0°44′19′′, Dip (North) = 32°25′15′′, Horizontal Force = 7.8204 (British Units) = 0.36059 (C.G.S. Units).
OBSERVATIONS OF MAGNETIC DECLINATION AND DIP.
1887.
H.K.M.T.
Declination, East.
Observer.
H.K.M.T.
Dip, North.
Needle.
Observer.
January,
February,
March,
15 2
14. 2h. 43. p.
14 2 45 p.
49 p.
April,
16 2
59 P.
0° 43′ 36′′
0 41 50
0 42 34
0 42 46
F.G.F.
97
14 3h. 41 p.
15 3 5 p.
32° 24′.12 23..23
No. 1
F.G.F.
2
99
4 20 p.
M.A.
14 3 40 p.
4 35
14 3
5
3 45
May,
16 2
38
p.
0 41
0
June,
15 2 21 p.
0 41 11
F.G.F.
M.A.
16 3 16
4 11 p.
15 3 16
4 12 p.
July,
16 2
August,
17
2
36 p.
0 42 50
38 P.
0 42 30
September,
14
2 45 p.
October,
15
2
19 p.
November,
December,
15 2 37 p.
14 2 28 p.
0 40 28
0 41 48
0 42 0
0 42 54
F.G.F.
M.A.
F.G.F.
M.A.
F.G.F.
16 2 50 3 42 14 3 6
3 55
17 3 37
3 58
16 3 35
ÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅ Å Å
23.81
1
M.A.
23.77
2
"}
22.05
I
25
22.58
2
""
19.75
39
22.25
39
23.08
24.98
>>
23.71
1
25.50
25.78
""
20.62
6
"
24.71
1
20.38
2
19.77
1
20.54
23.12
F.G.F.
21..85
2
16
co co co
15 3 5 p.
20.57
1
M.A.
3
49 P.
22.48
3
32 p.
22.83
1
F.G.F.
20.33
2
"
16
39
3 14 p.
22.26
21.25
>"
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