Cumberland Isles. 
TERRA AUSTRALIS 
with the swinging of the ship, and took place one hour before the i8tw. 
moon’s passage, as it had done amongst the barrier reefs ; from ten Sauirdayie. 
to fifteen feet seemed to be the rise by the shore, and the Hood came 
from the northward. 
We returned on board the ship at noon; but I deferred getting 
under way till next morning, on account of the wind blowing fresh, 
and some business to be executed which could not be attended to 
whilst among the reefs. This gave an opportunity of making fur- 
ther observations by the time keepers, from which it appeared that 
they gave only 8' 36", 3 of longitude west from Upper Head, with 
the rates there found ; whereas by the survey, we had made 12 , 37^, 
The time keeper No. 520, taken alone, gave 1 1 ' 3/5", 8 ; and when the 
correction, afterwards found necessary in the Gulph of Carpentaria, 
is applied, the difference becomes 12' 41'', almost exactly as by sur- 
vey. The previous positions of the ship amongst the reefs, and 
wherever I had not any bearings of fixed points, have therefore 
been deduced from this time keeper. 
The latitude of the anchorage, from observa- 
tions to the north and south, was - - 20° 45' 28" S, 
Longitude from a chain of bearings, connected 
with the fixed station in Broad Sound, 149 34 i 2 E. 
Variation of the theodolite, observed on the 
north-west beach of / 2, - _ y gg east; 
but it differed on the north head of the island, from 7 0 to 9 0 23' east, 
in the space of a few j^ards. 
The variation amongst the Barrier Reefs has not been men- 
tioned ; but five azimuths and amplitudes were taken between the 
6th, p. m. and the 15th a. m. When corrected to the meridian, the 
extremes were 7° 53' and 7° and the mean, in latitude so 0 ’ 44', 
longitude 150° 32', will be 7 0 30' east. 
At daylight on the 17th, the breeze was moderate at E. by N., Sunday 17 . 
with fine weather ; and in steering northward, close to the wind, w e 
passed three miles to leeward of a dry bank of rocks and sand. 
