Page:Proceedings of the Royal Society of London Vol 69.djvu/270

254 Captain Eobertson was not present at the Royal Alfred Observatory, but observed the eclipse from the deck of his ship, ss. " Ugina," of the British India Steam Navigation Company, in Port Louis harbour, 6| miles S.W. by W. of the Observatory.

An accident prevented Mr. Claxton from observing the second and third contacts. Mr. Claxton and myself watched the contacts 011 the ground-glass screens of our respective cameras.

Times of the 10-sccond Bells. The times of the 10-second bells of the eclipse clock which was one of the clocks used by the late Sir G. B. Airy, K.C.B., in the Harton Colliery experiment were recorded by Lieutenant F. W. Robertson, R.E., with the chronometer Kullberg 3400, that chronometer being l m O4 fast.

No. of Bell.

Observed time.

True local time.

h. m. s.

h. m. s.

1

7 52 42 -3

7 51 41 -9

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52-3

51-9

3

53 2-3

52 1-9

4

12-2

11-8

5

22-1

21-7

32-1

31-7

7

41-9

41-5

8

51 9

51-5

9

54 1-8

53 1 '4

10

11-8

11-4

11

21-8

21-4

12

31-7

31-3

13

41-8

41-4

14

51-8

51-4

15

55 1-8

54 1-4

16

11-8

11 '4

17

21-7

21-3

18

31-7

31-3

19

417

41-3

20

51-8

51-4

21

56 1-6

55 1 '2

22

11-6

11-2

23

21 -6

21-2

24

31-6

31-2

Staff-Sergeant R. M. Smith called out the numbers of the bells as each rang.

Photographs of the Corona. These were taken on three different scales ; the first on a scale of 8 inches to the Moon's diameter, to show the prominences and lowest corona ; the second on a scale of 2'4 inches, to show the general structure of the corona; the third on a scale of 0'3 inch, to show the coronal streamers to the greatest possible extension. The aperture employed in each case was the same, viz., 4 inches, and the light-gathering powers on the plate of the three instruments were nearly in the proportion of 1, 11, and 700.