d reduced to the tents on Point Alexander, 12 deg.
47' 16" S.

_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 deg. 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 there on the 9th, were as
under:

Earnshaw's No. 543, slow 2h 41' 0.91" and losing 16.53" per day.
Earnshaw's No. 520, slow 2h 27' 19.55" and losing 30.83" per day.

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 deg. 43' 3.5", or 7'16" greater than
the lunars. Were a rate used, equally accelerated from that of
Observation Island to what was found in Caledon Bay, the longitude would
be 0' 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 consequently the acceleration cannot here be
admitted.

In constructing the chart 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 longitude was preserved by a connected
chain of bearings, mostly taken on shore. The time-keeper reckoning from
Observation Island, and 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 difference 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 alteration to
be made in these stations. The difference of 2' 41" is therefore
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 mea