Height Dip. Differ. Therm. Differ. TJ •
Lat; Long. No. Date. eye. S c Obs. Tab. + Sea. Air. + - Baro. North. East. X) Remarks.
1816. f. i. , n / n 0 0 r t r j - v o / feet.
82 Aug. 21. 14 3 26 3 41 15 76 75 I 29.74 This and the following were
observed towards sunset; they
exhibit a considerable degree of
refraction above what is usual.
The sights on this morning in the
same place gave upwards of 1/
greater dip.
83 Aug. 21. 15 3 3 29 3 41 12 76 75 1 29.74 All other circumstances the
same as in No. 82.
84 Aug. 22. 16 3 52 3 56 4 75 76 1 29.80 Fresh breeze from SE, with a
remarkably clear sky. The horizon
uncommonly sharp.
85 Sept. 4i 12 3 46 3 25 21 81 83 2 29.86 36 10 126 30 56 Wind moderate from WNW.
Clear weather.
86 Sept. 4. 12 3 42 3 25 17 81 83 2 29.86 36 8 126 35 56 All other circumstances the
same as in No. 85. Parts of the
horizon observed SSW and NNE.
87 Sept. 5-. 15 3 47 3 19 2 79 80 1 29.80 35 40 126 17 Parts of the horizon observed
WNW and ESE.
88 Sept. 7. 15 3 3 33 3 4! 8 74 80 6 2984 34 32 126 34 The morning has been exceedingly
hot before the breezes set
in from sea at 11 A.M.
89 Sept. 7. 15 3 3 27 3 41 14 : 74. 80 ! 6 29.84 34 22 126 34 AH other circumstances the
same as in No. 88.
1817.
90 March 3. 14 3 57 3 41 16 82 84$ 2$ 29.74 2 18 102 20 After a very hot day.
91 March &. 14 8 4 49 3 46 1 3 83 85 ! 2 29.73 3 40 10035 Parts of the horizon observed
ESE and WNW. See further
remarks under 93. Instrument
: readjusted.
92 March 5. 14 8 4 50 3 46 I 4 83 85 2 29.73 165 Parts of the horizon observed
NE and SW. All other circumstances
as in No. 91.
93 March 5. 14 8 4 53 3 46 1 7 Parts of the horizon observed
SSE and NNW. These three
observations (Nos. 91, 92, and
93) were made under the most
favourable circumstances, and
may be considered as shewing
the accuracy which the instrument
is capable of attaining. The
sea was so perfectly smooth, that
not the slightest motion could be
detected. The horizon at all the
parts observed was sharp, and
better defined than I recollect
to have seen i t ; and, what is not
often the case, the opposite parts
were alike in strength of light,
&c. The day has been hot, but
not close, with a light breeze
from the Southward. The dip
is very great, but the observations
’ were made with such care, that.
there can be no doubt of their
accuracy.
94 March 8. 14 8 4 33 3 46 47 84 84 29.86 5 12 100 14 120 There had been a light breeze
0 0 from the North in the morning;
: but for an hour before these sights
were taken it bad been calm.
94 March 8. 14 8 4 58 3 46 1 12 84 82$ 1§ 29.86 120 Nearly the same place as No.
m 9 4(a); but the. other circumI
stances were changed, as the
sea breeze at NW bad set in
about a quarter of an hour,
whereas in. the last instance it
was calm. Die above angles
were taken with great care.
The horizon sharp. Parts of
the horizon observed NW and
SE.
Height of
eye.
1817.
March 19.
March 19.
March 20.
July 22.
July 24.
July 25.
July 26.
f. 'i.
14 8
14 8
14 8
Dip.
3 48
3 48;
3 46
3 46 79$
29.78
Lat.
North.
South.
34 0
Lotrg.
East.
The wind steady and moderate
at NE; atmosphere clear; horizon
well defined; a long swell
from S W. This swell, which was
not high, produced an obvious
effect on the dip angle, as observed,
the two horizons alternately
separating and overlapping;
this change was however so slight
that I have not been able to measure
it.
All other circumstances as in
No. 95. Parts of the horizon
observed NE and SW.
During the night there has
been a light breeze from East; at
this moment it is freshening up a
little. The atmosphere is clear;
horizon sharp; a long low swell
from SW, as yesterday.
I t has been calm, or nearly so,
during the night; occasionally a
light air from SE and S. All
circumstances favourable.
During the night there has
been, a light wind from S W. The
weather is more hazy than when
the wind was from the Eastward,
and the horizon not so distinctly
marked; but the above sights are
good. There is still a swell from
SW, which causes some little uncertainty
as to the exact moment
of taking the angle.
In the night there has been
a light breeze from W by S.
Weather hazy; but the horizon
sharper than yesterday morning.
During the night almost calm;
just now a light air from the NE.
Parts of the horizon observed
NE and SW.
Fine fair clear weather, but
with so high a swell as to render
the observation difficult Wind
light from N, after having been
blowing fresh.
Light breezes from the Northeastward;
smooth water, and a
clear cool air: hazy about the
land. The distance from the
South coast of Africa was about
8 or 9 leagues. All circumstances
favourable. No current: we have
probably been too near shore
Tor it.
Light breeze from the SW,
with a long swell. Hazy weather.
The wind has been from the West
for 24 hours; at first blowing
hard, but latterly moderate, the
current setting us to the SW
about a mile an hour. A very
heavy dew falling this evening.
Parts of the horizon observed
East and West.
Moderate breeze from the NE ;
air hazy; long high swell from the
Westward. From observations
by stars and chronometers, it has
been ascertained that there is not