Narrative of a Survey of the Intertropical and Western Coasts of Australia eBook

Philip Parker King
This eBook from the Gutenberg Project consists of approximately 494 pages of information about Narrative of a Survey of the Intertropical and Western Coasts of Australia.

Upon placing the instrument with the end marked 180 degrees in the direction North 45 West the needle shifted on the opposite side to 5 30.

The mean of the observation, on placing either end North and South was 3 6 3/4 degrees.

The mean of the observation, on placing either end North-East and South-West was 3 45.

The mean of the observation, on placing either end South-East and North-West was 4 35.

1823.  February 28 :  At Sea :  11 44 South :  10 12 West :  1 25 :  South :  17 to 18 West :  -.

Upon placing the instrument in the direction of North 45 East the needle dipped 2 10.

Upon placing the instrument in the direction of North 60 East the needle dipped 2 50.

Upon placing the instrument in the direction of North 70 East the needle dipped 4 25.

Upon placing the instrument in the direction of North 80 East the needle dipped 5 15.

Upon placing the instrument in the direction of North 90 East the needle dipped 8 15.

Upon placing the instrument in the direction of North 92 East the needle dipped 14 00.

Upon placing the instrument in the direction of South 60 East the needle shifted.

Upon placing the instrument in the direction of South 45 East the needle shifted 2 20.

Upon placing the instrument in the direction of South 45 West the needle shifted 1 40.

Upon placing the instrument in the direction of North 45 West the needle shifted 1 00.

Mean when placed at North-East and North-East 1 55.

Mean when placed at North-West and South-East 1 40.

February 28 :  At Sea :  11 30 1/2 :  10 20 :  0 45 :  South :  17 to 18 West :  -.

February 28 :  At Sea :  11 5 1/2 :  10 34 :  0 15 :  North :  17 to 18 West :  -.

From the above observations, it would appear that the Magnetic Equator crosses the meridian of 10 1/2 degrees West, in 11 degrees 12 minutes South latitude.  At the latter observation—­when the direction of the instrument was changing, the needle remained quite stationary, the south end of the needle pointing to the north, until the change was effected; it remained in this position for two seconds of time, and then suddenly shifted to the opposite, its proper, direction; its movements were, however, very sluggish and irregular in its shifting end for end.  The day was so rainy that no observation could be made for the variation of the compass.

March 1 :  At Sea :  10 1 South :  11 31 West :  3 32 1/2 :  North :  17 44 West :  -.

March 2 :  At Sea :  8 21 South :  12 57 :  6 50 :  North :  18 00 :  -.

March 5 :  At Sea :  7 3 South :  15 42 :  11 22 1/2 :  North :  16 5 :  -.

March 7 :  At Sea :  4 17 South :  18 50 :  19 15 :  North :  13 18 :  -.

March 9 :  At Sea :  0 0 1/3 South :  22 6 1/4 :  27 45 :  North :  12 51 :  -.

March 24 :  At Sea :  17 4 North :  35 40 :  54 23 3/4 :  North :  11 3 :  Correct to 3/4 degree.

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Narrative of a Survey of the Intertropical and Western Coasts of Australia from Project Gutenberg. Public domain.
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