TERRA AUSTRALIS. 
217 
Caledon Bay.~\ 
that by survey worked back from the fixed point in Caledon Bay, 
meet each other on Jan. 5 p. m. at Connexion Island ; and the differ- 
ence was there found to be 2' 41", which the time keeper gave more 
to the east. This may have arisen from Observation Island being 
laid down in a longitude too great by that quantity, or Caledon Bay 
too little, or from a small error in each ; but the time keeper was 
not thought entitled to such perfect confidence, as to cause an altera- 
tion to be made in these stations. The difference of 2' 41" is there- 
fore corrected by applying— 16", 3 of longitude per day to the time 
keeper, from Observation to Connexion Island ; Groote Eylandt is 
laid down mostly from the time keeper, with the fixed correction 
— 2' 41" all round ; and from thence to Caledon Bay the chart is 
constructed from bearings and observed latitudes. 
The mean dip of the south end of the needle, ob- 
served at the tents, was - 36*28' 
Variation of the theodolite, - - - 2 20 E. 
On board the ship, at anchor off the south-west side 
of the inner island at the entrance, the variation 
from three compasses, with the head N. W. by W., 
was 2 0 2 6 V ; by the surveying compass alone, 
2° 46'' east, and this, which I consider to be the 
best, would be, corrected, - - 1 14 E. 
At my different stations on shore, the variation seemed to be 
between 2 0 and 2 0 20' east ; except on the north-east end of the outer 
island in the entrance, where it appeared to be no more than i° 30'. 
The rise of tide in Caledon Bay was so small, that nothing 
certain could be determined on board, either upon the quantity or 
the time ; but it appeared from the observations of lieutenant Fowler 
at the tents, that there were two tides in the day, the rise of which 
varied from 3 feet 10, to 4 feet 10 inches; and that the time of high 
water took place at nine hours and a half after the moon passed over 
and under the meridian. 
On board the ship, the range of the thermometer was from 
VOL. 11. f f 
1803. 
February. 
