No variations were observed at the anchorage; but two amplitudes off Gatcombe Head gave 11° 11', and azimuths with three compasses, 10° 50' east, the ship's head being W. S. W. and W. N. W. These being reduced to the meridian, will give the true variation to be 8° 40' east.
This is an increase of near 2° from Bustard Bay; and seems attributable to the attraction of the granitic land which lay to the westward, and drew the south end of the needle that way.
The rise of tide at the place where I slept near the head of the port, was no more than four feet; but upon the rocky islet in the northern entrance, there were marks of its having risen the double of that quantity. The time of high water was not well ascertained, but it will be between eight and nine hours after the moon's passage over and under the meridian.
MONDAY 9 AUGUST 1902
On getting under way at daylight of the 9th, to prosecute the examination of the coast, the anchor came up with an arm broken off, in consequence of a flaw extending two-thirds through the iron. The negligence with which this anchor had been made, might in some cases have caused the loss of the ship.
[EAST COAST. KEPPEL BAY.]
In following the low and rather sandy shore, northward to Cape Capricorn, we passed within a rocky islet and another composed of rock and sand, four miles south-east of the cape, the soundings being there from 8 to 9 fathoms; and at ten o'clock hauled round for Cape Keppel, which lies from Cape Capricorn N. 80° W., ten miles. The shore is low, with some small inlets in it, and sand banks with shoal water run off more than two miles; at six miles out there is a hummocky island and four rocks, one of which was at first taken for a ship. We passed within these, as captain Cook had before done; and at half past two in the afternoon anchored in Keppel Bay, in 6 fathoms soft bottom, three-quarters of a mile from a head on the east side of the entrance.
My object in stopping at this bay was to explore two openings marked in it by captain Cook, which it was possible might be the entrances of rivers leading into the interior. So soon as the ship was secured, a boat was sent to haul the seine, and I landed with a party of the gentlemen to inspect the bay from an eminence called Sea Hill. There were four places where the water penetrated into the land, but none of these openings were large; that on the west side, in which were two islands, was the most considerable, and the hills near it were sufficiently elevated to afford an extensive view; whereas in most other parts, the shores were low and covered with mangroves. These considerations induced me to begin the proposed examination by the western arm; and early next morning [TUESDAY 10 AUGUST 1802] I embarked in the Lady Nelson, intending to employ her and my whale boat in exploring the bay and inlets, whilst the botanists made their excursions in the neighbourhood of the ship.
The depth in steering for the western arm was from 6 to 9 fathoms, for about one mile, when it diminished quickly to 2, upon a shoal which seemed to run up the bay; the water afterwards deepened to 5 and 7 fathoms, but meeting with a second shoal, the brig was obliged to anchor. I then went on in my boat for the nearest of the two islands, passing over the banks and crossing the narrow, deep channels marked in the plan. The two islands are mostly very low, and the shores so muddy and covered with mangroves, that a landing on the northern and highest of them could be effected only at the west end; but a hillock there enabled me to take an useful set of bearings, including Mount Larcom, which is visible from all parts of this bay, as it is from Port Curtis.
In the afternoon I proceeded up the western arm, having from 3 to 8 fathoms close along the northern shore; and about four miles up, where the width was diminished to one mile, found a landing place, a rare convenience here, and ascended a hill from whence there was a good view. At five or six leagues to the south, and extending thence north-westward, was a continuation of the same chain of hills which rises near Bustard Bay and passes behind Mount Larcom; but at the back of Keppel Bay it forms a more connected ridge, and is rocky, steep, and barren. Within this ridge the land is low, and intersected by various streams, some falling into the western arm at ten or twelve miles above the entrance, and others into the south-west and south arms of the bay. The borders of the western arm, and of its upper branches so far as could be perceived, were over-run with mangroves; whence it seemed probable the water was salt, and that no landing was practicable, higher than this station; the sun also was near setting when my bearings from West-arm Hill were completed; and I therefore gave up the intention of proceeding further, and returned to the northern island in the entrance, to pass the night.