Volume II Part 29 (2/2)

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 s.h.i.+fted.

Upon placing the instrument in the direction of South 45 East the needle s.h.i.+fted 2 20.

Upon placing the instrument in the direction of South 45 West the needle s.h.i.+fted 1 40.

Upon placing the instrument in the direction of North 45 West the needle s.h.i.+fted 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 lat.i.tude. 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 s.h.i.+fted to the opposite, its proper, direction; its movements were, however, very sluggish and irregular in its s.h.i.+fting end for end. The day was so rainy that no observation could be made for the variation of the compa.s.s.

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 : -.

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