216 
A VOYAGE TO 
1803 . 
February, 
[North Coast. 
intentionally ; for after the trick put upon Mons. Labillardibre at the 
Friendly Islands, in the words given him for the high numerals, they 
are always to be suspected. 
During the week we remained in Caledon Bay, the following 
astronomical observations were taken. 
m 
Latitude from three observations to the north 
and south, taken in a boat astern of the ship 
and reduced to the tents on Point Alexander, 1 2° 47' 16" Sv 
Longitude from twelve sets of distances of stars 
east and west of the moon, taken on a 
stand by lieut. Flinders, and of which the 
individual results are given in Table VI. 
of the Appendix No. I, - - 136 35 47,5 E. 
The rates of the time keepers were found from morning’s 
altitudes of the sun in an artificial horizon, between Feb. 3 and 8 ; and 
the means, with the errors from mean Greenwich time at noon ther,e 
on the 9th, were as under : 
Earnshaw’s No. 543, slow 2 h 4i' o",gi and losing 16 ", 53 per day. 
No. 520, - 2 27 19, 55 ~ - 8°» 8 3 
No. 520 had been accidentally let down in Blue-mud Bay, 
whence its longitude is not now noticed ; that given by No. 543 on 
Feb. 3, with the rate from Observation Island, was 136° 43' 3" ,5, or 
7' 16" greater than the lunars. Were a rate used, equally accele- 
rated from that of Observation Island to what was found in Caledon 
Bay, the longitude would be o' 55" less than the lunars; but during 
the twelve days occupied in circumnavigating Groote Eylandt, it was 
proved that this time keeper was keeping its former rate, and con- 
sequently the acceleration cannot here be admitted. 
In constructing the <jhart of the coast and islands between 
Pellew’s Group and Caledon Bay, a time keeper was required only 
in laying down the south and east sides of Groote Eylandt, and the 
main coast up to Cape Barrow; in all the remaining parts the longi- 
tude was preserved by a connected chain of bearings, mostly taken 
©n shore. The time-keeper reckoning from Observation Island, and 
