It is impossible for me to say whether these or the former are the nearest
to the truth; nor can I assign any probable reason for so great a
disagreement. We certainly can observe with greater accuracy through the
telescope, than with the common sight, when the ship is sufficiently
steady. The use of the telescope is found difficult at first, but a little
practice will make it familiar. By the assistance of the watch, we shall be
able to discover the greatest error this method of observing the longitude
at sea is liable to; which at the greatest does not exceed a degree and a
half, and in general will be found to be much less. Such is the improvement
navigation has received by the astronomers and mathematical instrument-
makers of this age; by the former from the valuable tables they have
communicated to the public, under the direction of the Board of Longitude,
and contained in the astronomical ephemeris; and by the latter, from the
great accuracy they observe in making instruments, without which the tables
would, in a great measure, lose their effect. The preceding observations
were made by four different sextants, of different workmen. Mine was by Mr
Bird; one of Mr Wales's by Mr Dollond; the other and Mr Clerke's by Mr
Ramsden; as also Mr Gilbert's and Smith's, who observed with the same
instrument.
Five tolerably fine days had now succeeded one another. This, besides
giving us an opportunity to make the preceding observations, was very
serviceable to us on many other accounts, and came at a very seasonable
time. For, having on board a good quantity of fresh water, or ice, which
was the same thing, the people were enabled to wash and dry their clothes
and linen; a care that can never be enough attended to in all long voyages.
The winds during this time blew in gentle gales, and the weather was mild.
Yet the mercury in the thermometer never rose above 36; and was frequently
as low as the freezing point.
In the afternoon having but little wind, I brought-to under an island of
ice, and sent a boat to take up some. In the evening the wind freshened at
east, and was attended with snow showers and thick hazy weather, which
continued great part of the 16th. As we met with little ice, I stood to the
south, close hauled; and at six o'clock in the evening, being in the
latitude of 64 deg. 56' S., longitude 39 deg. 35' E. I found the variation by
Gregory's compass to be 26 deg. 41' W. At this time the motion of the ship was
so great that I could by no means observe with any of Dr Knight's
compasses.
As the wind remained invariably fixed at E. and E. by S., I continued to
stand to the south; and on the 17th, between eleven and twelve o'clock, we
crossed the Antarctic Circle in the longitude of 39 deg. 35' E., for at noon we
were by observation in the latitude of 66 deg. 36' 30" S. The weather was now
become tolerably clear, so that we could see several leagues round us; and
yet we had only seen one island of ice since the morning. But about four
p.m. as we were steering to the south, we observed the whole sea in a
manner covered with ice, from the direction of S.E., round by the S. to W.
In this space, thirty-eight ice islands, great and small, were seen,
besides loose ice in abundance, so that we were obliged to luff for one
piece, and bear up for another, and as we continued to advance to the
south, it increased in such a manner, that at three quarters past six
o'clock, being then in the latitude of 67 deg. 15' S., we could proceed no
farther; the ice being entirely closed to the south, in the whole extent
from E. to W.S.W., without the least appearance of any opening. This
immense field was composed of different kinds of ice; such as high hills,
loose or broken pieces packed close together, and what, I think,
Greenlandmen call field-ice. A float of this kind of ice lay to the S.E. of
us, of such extent, that I could see no end to it from the mast-head. It
was sixteen or eighteen feet high at least; and appeared of a pretty equal
height and surface. Here we saw many whales playing about the ice, and for
two days before had seen several flocks of the brown and white pintadoes,
which we named Antarctic peterels, because they seem to be natives of that
region. They are, undoubtedly, of the peterel tribe; are in every respect
shaped like the pintadoes, differing only from them in colour. The head and
fore-part of the body of these are brown; and the hind-part of the body,
tail, and the ends of the wings, are white. The white peterel also appeared
in greater numbers than before; some few dark-grey albatrosses, and our
constant companion the blue peterel. But the common pintadoes had quite
disappeared, as well as many other sorts, which are common in lower
latitudes.
[1] "In the midst of this heavy gale, I tried Dr Lind's wind-gage, and
the water in it was depressed by the force of the wind 45/100 of an
inch." W. According to the same authority, it was equally depressed on
the 30th, and on the 1st December, it sunk 4/10 of an inch in the
squalls. Mr G.F. relates an interesting enough alarm that occurred
during this stormy weather. "A petty officer in the forepart of the
vessel, awaking suddenly, heard a noise of water streaming through his
birth, and breaking itself against his own and his mess-mates' chests;
he leaped out of his bed, and found himself to the middle of his leg
in water.
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