300
from simultaneous observations. As explained above the probable errors are not trustworthy. In course of time with changed P different results may be expected. These corrections are applied to all observations made with the new inagnetometer.
Table XV.
Results of Magnetic Observations in 1898.
Magnetic Force.
Declina-
Month.
tion East. Dip North
English Units.
Metric Units.
C. G. S. Units.
X
Y
Total.
X
Y
Total.
X
Y
Total.
February,
0° 24′ 31′′ 31° 35′ 11′′
7.9389
April,
22 52
34 51
7.9312
June,
21 46
32 50
7.9415
4.8755
4.8815 9.3197 4.8757 9.8100 9.3186
August,.....
21 16
30 26
7.9442
October,
22 21
32 47
December,. 22 36
33 37
7.9424 7.9385
8.6005 2.2508 4.2971 8.6570 2.2480 4.2027 3.6617 2.2480 4.2967 4.8696 9.8180 3.6620 2.2453 4.8700 9.3197 3.6621 2.2482 4.8703 9.3166 3.6603 2.2484
0.36605 0.36570
0.22508 | 0.42971
0.22480 | 0.42927
0.36617
0.22480 | 0.42067
0.36629
4.2961 4.2971 0.36621 0.22482 | 0.42971 4.2958 0.36609 | 0.22484 0.42958
0.22453 | 0,42964
Meau,
0 22 34 31 33 17
7.9394
4.8758 9.3171 3.6007 2.2481
4.29600.36607 | 0.22481 | 0.42960
Table XVI, exhibits the means of 15 years' observations, but as no observations were made from May, 1890, till April, 1891, inclusive, less weight has been attributed to 1890 and 1891. The values for other months without observations were interpolated. All the results have been referred to the middle of the year by applying corrections for secular variation. The monthly means refer, as far as secular variation is concerned, to the middle of 1891. All the observations were made early in the afternoon, but as no correction for daily variation has been applied, the annual and semi-annual inequalities have not been determined.
Table XVI.
Means of Magnetic Observations made during 15 years in Hongkong.
Force.
Year.
Declina- tion East. Dip North.
Force.
Month.
Declina- tion East.
Dip North.
Y
Total.
X
I
Total.
1885..
45 10
1886..
42 57
25 32
.22909
.49725 March,
1887...
42 7
.22902
.42773 April,
1888...
40 59
.22884
.42760 May,
1884... 0° 47′ 9329 26′ 35′′ | 0.36026 | 0.22902 | 0.42689 | January,
26 22 .36021 .22894 42681 February,.
.30063 22 24 .36125 20.58 .80131
0° 35′ 46′′ 32° 4′_Y" | 0.36289 0.22734 | 0.42824
35 29
34 50
51
34 4
5
33 57
4 25
.36297 .22730 .42827 .86297 22723 .42824 .36297 .22726 .42825 .86299 .22746 .42837
1889...
38.30
16 53 .36190
.22862
.42806 June,
34 0
4 6
.36309 52748
.42847
1890...
37 20
8 33 .36233
.22767
49792 July,
34 21
4 33
36298
22747 .42838
1891...
35 17
1892..
33 33
1893...
31 3
31 56 40
5 24 .36255 3 31 .36352 36434
.22734
.42704 August,
34 0
4 25
.36284
.22736 .42821
.22767
.42893 September, 34 26
4 35
.36281
.22786 .42818
.22717
.42986 October,.. 85 26
5 14
1894...
29 13
53 19
.30448
.22077
42926 November, 35 53
1895...
27 47
46 54
.36179
.22595
42913 December, 35 48
6 2 4 55
.36281 .22746 .42822 .36290 22763 .42841 .36291 .22746 .42834
1896...
26 G
41 32
36462
22510 .42852
1897...
23 25
37 03
.36546
.22408 .42916
1898...
22 37
33 25
.36604 .22481 .42957
Mean
0 34 45
32 4 7 0.36295 | 0.22739 0.42831 | Mean,
0 34 50 32 4 19 0.36293 | 0.22740 | 0.42830