APPENDIX.
511
TABLE X.
Variations of rate and errors in longitude, made by one or both of Earnshaw's time keepers, No. 543 and No. 520, during the circumnavigation of Terra Australia, and from Port Jackson to the island Mauritius.
| Departure taken. | Rates of time keepers losing. | Variations of rate. | Errors in long. on arriving. | Daily part of supplemental errors. | ||||||||||||
| Place. | Longit. East | No. 543 | No. 520. | Mean. | During the passage. | Number of days. | Daily acceleration. | With rate before found. |
With rate accelerated. | |||||||
| ° | ′ | ″ | ″ | ″ | ″ | |||||||||||
| Port Jackson | 151 | 11 | 49 | 8,63 | 19,52 | 14,075 | ||||||||||
| Keppel Bay | 150 | 58 | 20 | As at Port Jackson | ″ | ″ | ′ | ″ | ′ | ″ | ″ | |||||
| Broad Sound | 149 | 46 | 53 | 9,62 | 21,41 | 15,515 | 1,44 | 27,7 | 0,052 | 7 | 14 | E. | 2 | 3,6 | E. | 4,46 E. |
| Sweers' I. | 139 | 44 | 52 | 21,47 | First rate | 0,06 | 51,9 | Not used. | 2 | 50,2 | 3,28 | |||||
| — | — | 14,74 | ||||||||||||||
| (The time keepers were let down in this passage, and set going with the difference of time allowed.) | ||||||||||||||||
| Observ. I. | 137 | 3 | 14,8 | 14,93 | 0,19 | 16,4 | 0,0116 | 0 | 24,9 | 0 | ||||||
| Connexion I. | 136 | 24 | 50 | Not ascertained. | 10, | 2 | 41 | 16,1 | ||||||||
| Bustard Isles | 136 | 26 | 43 | As at Observation I. | ||||||||||||
| Caledon Bay | 136 | 35 | 47,5 | 16,53 | 1,60 | 16,9 | 0,0947 | 4 | 35 | 0 | 59,5 | 3,52 | ||||
| Coepang Bay | 123 | 35 | 46,2 | 16,73 | 33,99 | 25, 36 | 0,20 | 51,3 | 0,0039 | 3 | 22,2 | 2 | 3,7 | 2,41 | ||
| Goose. I. Bay | 123 | 9 | 37,6 | 19,63 | 34,07 | 26, 85 | 1,49 | 40,2 | 0,0371 | 19 | 52,4 | 12 | 11,6 | 18, 2 | ||
| Port Jackson | 151 | 11 | 49 | First rates not known | 19,9 | 5 | 42,5 | 17, 2 | ||||||||
| — | — | 33,38 | Latter rate | |||||||||||||
| Wreck Reef | 155 | 18 | 50,5 | 34,08 | After shipwreck | 26, | Not used | 14 | 35,9 | W. | 33, 7 W. | |||||
| — | — | 34,13 | Latter rate | |||||||||||||
| Coepang Bay | 123 | 35 | 46,2 | 36,74 | 2,61 | 36,2 | 0,0721 | 12 | 48 | E. | 0 | 40, | 1, 1 E. | |||
| Port Louis | 57 | 29 | 57 | 36,90 | 0,16 | 35, | Not used | 10 | 43,5 | 18, 4 | ||||||
The irregularity of this table, compared with Table VII. of the Appendix to Vol. I., arises from its having been sometimes found advisable to make use of one time keeper in preference to both,—from some stations being fixed by the survey where no rates are found,—and latterly from No. 543 having stopped. In other respects, the explanation which follows the former table will generally apply here.
