Page:A Voyage to Terra Australis Volume 1.djvu/295

1802.
January.

The Latitude of the tents in Princess-Royal Harbour, from three meridian zenith distances of the sun, observed with Ramsden's universal theodolite, was . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	°  35	′ 2	″ 5	south.
Longitude from thirty-one sets of distances of the sun east and west of the moon, of which the particulars are given in Table I. of the Appendix to this volume, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	117	53	10	east.

These being reduced by the survey to Bald Head, at the entrance of the sound, will place it in

	°	′	″
Latitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	35	6	15	south.
Longitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	118	0	45	east.[1]

The mean rates of the time keepers, deduced from equal altitudes taken on and between Dec. 15 and Jan. 1, and their errors from mean time at Greenwich, at noon there on the last day of observation, were as under:

			ʰ	′	″		″
Earnshaw's	No. 543,	slow	0	21	46,69	and losing	6,46	per day.
	No. 520,		0	51	2,81		16,72
Arnold's	No. 176,		1	0	45,46		9,26
	No. 82 went too irregularly to be worth taking.

The longitude of the tents given by the time keepers on the first day of observation, with the Cape rates, was as follows:

Earnshaw's No.	543,	118°	14′	49″	east.
	520,	117	59	22
Arnold's	176,	118	1	14

The two first, which generally throughout the voyage shewed themselves to be the best time keepers, were on a mean 13′ 56″ to the east of the lunar observations; but by using rates accelerating in

 

1. The situation of Bald Head, in captain Vancouver's chart, is 35° 6′ 40″ south, and 118° 16′ 30″ east from lunar observations which were not corrected for the errors of the astronomical tables. The situation assigned to Bald Head in the voyage of the French admiral D'Entrecasteaux, is 35° 10′ south, and 118° 2′ 40″ east; but since the admiral passed it at six in the evening, and in blowing weather, an error of a few minutes may have entered into both latitude and longitude.