DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.20131#0320
SECTION IV.
GENERAL RESULTS OF THE CORRESPONDING MAGNETIC
OBSERVATIONS AT BOMBAY.
I. Declination. II. Horizontal Intensity. III. Dip. IV. Vertical Intensity. V. Total Intensity.
In the following tables we give the principal mean results of the Bombay magnetic
observations, which are published for every year at Bombay by the zealous superinten-
dent, Lieutenant E. F. T. Fergusson, I.N. These tables give a very characteristic apercu
of the magnetic elements and their variations, and we shall have occasion to return
to them for comparison, when communicating the detail of our own observations.1
Days of disturbances are marked by asterisks (*).
The declination. at Bombay is East.
The following are the days of disturbances for 1854-7:
1854. November 1 and 8.
1855. February 8; March 12; April 4; May 27; July 18, 19, and 20; September 27;
October 2, 18, and 19; December 30. »
1856. No disturbance great enough to be measured occurred this year.
1857. May 7; September 2, 3, and 21; December 16, 17, 18, 27, and 28.
On all these days the disturbances were not very great.2 It so happened that
only one day, on which absolute determinations were taken by us, coincided with
1 The means of some corresponding observations, communicated to us at Madras for the period of our travels
in Southern India, are contained Section V., Group V., Station No. 35.
2 In higher latitudes the disturbances are not only much greater, but also show periodical laws decidedly
marked. See the most interesting researches of General Sabine, "On Periodical Laws discoverable in the Mean
Effects of the larger Magnetic Disturbances". Philosophical Transactions. February 27, 1851.
GENERAL RESULTS OF THE CORRESPONDING MAGNETIC
OBSERVATIONS AT BOMBAY.
I. Declination. II. Horizontal Intensity. III. Dip. IV. Vertical Intensity. V. Total Intensity.
In the following tables we give the principal mean results of the Bombay magnetic
observations, which are published for every year at Bombay by the zealous superinten-
dent, Lieutenant E. F. T. Fergusson, I.N. These tables give a very characteristic apercu
of the magnetic elements and their variations, and we shall have occasion to return
to them for comparison, when communicating the detail of our own observations.1
Days of disturbances are marked by asterisks (*).
The declination. at Bombay is East.
The following are the days of disturbances for 1854-7:
1854. November 1 and 8.
1855. February 8; March 12; April 4; May 27; July 18, 19, and 20; September 27;
October 2, 18, and 19; December 30. »
1856. No disturbance great enough to be measured occurred this year.
1857. May 7; September 2, 3, and 21; December 16, 17, 18, 27, and 28.
On all these days the disturbances were not very great.2 It so happened that
only one day, on which absolute determinations were taken by us, coincided with
1 The means of some corresponding observations, communicated to us at Madras for the period of our travels
in Southern India, are contained Section V., Group V., Station No. 35.
2 In higher latitudes the disturbances are not only much greater, but also show periodical laws decidedly
marked. See the most interesting researches of General Sabine, "On Periodical Laws discoverable in the Mean
Effects of the larger Magnetic Disturbances". Philosophical Transactions. February 27, 1851.