ON the 20th of March 1755, we presented an address to this illustrious
Body, intituled, “An Attempt to point out, in a concise manner,
the Advantages which would accrue from a periodic Review of the
Variation of the Magnetic Needle, throughout the known World;
requesting contributions thereto, by communicating such observations
concerning it, as had then been lately made, or could be procured from
correspondents in foreign parts.”
This address was read at the same time, and afterwards honoured with
a place in the Transactions, vol. xlviii. part ii. for 1754: which
favour we now acknowledge in the most grateful manner; and, pursuant
to our engagements, beg leave to lay before you some account of the
communications received, with a specimen of the uses and applications
which we have been enabled to make of those, and other assistances with
which we have been indulged.
On application to the Honourable the Commissioners of the Navy, we were
obliged with an order of free access to all their masters log-books and
journals.
The Directors of the Honourable East India Company granted the like
privilege.
The Honourable Committee of the Hudson’s Bay Company obliged us with
sundry observations, made, and tabulated, by their own Captains.
James Bradley, D. D. Regius Professor of Astronomy, and F.R.S.
favoured us with several observations made at the Royal Observatory at
Greenwich.
John Hyde, Esq; F.R.S. communicated a sett of useful observations,
extracted from two journals kept on board the Triton and Britannia East
Indiamen.
A correct journal kept on board the Delawar East Indiaman was handed to
us by a gentleman unknown.
Capt. George Snow furnished a considerable number of observations, made
with care and accuracy by himself, in several successive voyages to,
and from Barbadoes and Virginia; together with several remarks upon
the subject: _One_, which we apprehend to be material, we beg leave
to insert, as it meets with some confirmation by the tables annexed;
_viz._ “At Barbadoes the variation seems at a stand very near; for in
the road, 1752, I observed 5 degrees east; and by Mr. Halley’s draught,
in the year 1701, 5½ degrees: in 1747, at Port Royal keys, Jamaica, I
observed the variation 7° 20’ E.; and on the coast of Carthagena the
same week, off the high land of Sancta Martha, 7° 45’ E. nearly south
of Port Royal: Therefore these curves are not much altered; and the
curve at Jamaica is nearly at a stand, as tho’ tied; and the south part
of them, with the rest, dropping to the westward.”
Mr. Mungo Murray, author of a treatise on ship-building, presented
us with several observations taken on board the Prince Edward and
Chesterfield East Indiamen, and his Majesty’s ship the Neptune.
For all these favours we return our sincere thanks.
No observations made upon land have been received, except Dr. Bradley’s
aforesaid; which has frustrated our intentions of continuing the curves
from sea to sea.
By collecting, comparing, and adjusting, all these materials, we
have been enabled to construct variation-curves upon Dr. Halley’s
mercator-chart, adapted to the year 1756; which will soon be in
readiness to present to this Royal Society.
As a work of this kind requires much time, and a multitude of
observations, both by sea and land, to render it more perfect and
general; we hope the ingenious in all nations will lend their
assistance: By this means every periodic review will be productive of
improvement.
From the first instant that we made this affair the object of our
more particular consideration, we have attended to the mode of
increase and decrease in the variation: and as a considerable number
of observations, made at periodic times, and duly registered, seem to
be the most essential toward determining the laws of its mutation, or
proving its irregularity, we have therefore formed a sett of tables,
from actual observations collected for the years 1710, 1720, 1730, and
1744, the date of our last chart; which, together with Dr. Halley’s
for the year 1700, and the present chart now publishing, compleat six
reviews: These are tabulated, and shew the quantity of the variation,
at those several periods, to every 5 degrees of latitude and longitude
in the more frequented oceans; which we hope will prove acceptable, as
nothing of the like kind has yet appeared, or can easily be obtained.
Our materials have been so deficient, that even in the limits to which
our tables are confined, we have been obliged to leave blanks in some
of the above periods, for want of that concurrent testimony, on which
the numbers inserted are founded: but, considering the difficulties
unavoidably attending a work of this sort, and the little assistance
which we have met with from private hands, we hope that this Royal
Society will not only excuse those vacancies, but also those in the
great tracts of sea, as well as land, concerning which we are very
unwillingly obliged to be intirely silent.
Agreeable to our former address, we lay only what appear to be facts
before you, without attempting to introduce any hypothesis for the
solution of these phænomena; some of which (being very extraordinary)
we recommend peculiarly to the notice of those gentlemen, who may
endeavour the investigation of their causes.
Under the equator, in longitude 40° E. from London, the highest
variation during the whole 56 years appears to be 17°¼ W. and the
least 16°½ W.: and in latitude 15° N. longitude 60° W. from London,
the variation has been constantly 5° E. but in other places the case
has been widely different; for in the latitude 10° S. longitude 60° E.
from London, the variation has decreased from 17° W. to 7°¼ W., and in
latitude 10° S. longitude 5° W. from London, it has increased from 2°¼
W. to 12°¾ W.; and in latitude 15° N. longitude 20° W. it has increased
from 1° W. to 9° W.
But there is still a more extraordinary appearance in the Indian seas:
for instance, under the equator,
Longitude from| Variation in
_London_ | 1700. | 1756.
--------------+----------+---------
Degrees. | Degrees. | Degrees.
40 E | 16¾ W | 16¾ W
45 E | 17¾ W | 14½ W
50 E | 17½ W | 11¾ W
55 E | 16½ W | 8¾ W
60 E | 15¼ W | 6 W
65 E | 13½ W | 4½ W
70 E | 11½ W | 2¾ W
75 E | 9¾ W | 1 W
80 E | 7¾ W | 0¼ E
85 E | 5½ W | 1¼ E
90 E | 4¼ W | 1 E
95 E | 3¼ W | 0½ W
100 E | 2½ W | 1 W
--------------+----------+---------
Where the west variation in the longitude 40° E. is the same in both
the above years; and in 1700 the west variation seemed to be regularly
decreasing from longitude 50° E. to the longitude 100° E.; but in
1756 we find the west variation decreasing so fast, that we have
east variation in the longitude 80°, 85°, and 90° E; and yet, in the
longitude 95° and 100° E. we have west variation again.
Such are the irregularities, that experience hath shewn us, in the
variation of the magnetic needle; which appear so considerable, that we
cannot think it wholly under the direction of one general and uniform
law; but rather conclude, with the learned and judicious Dr. Gowen
Knight, Fellow of this Society, in the 87th prop. of his treatise
upon attraction and repulsion, That it is influenced by various and
different magnetic attractions, in all probability occasioned by the
heterogeneous compositions in the great magnet, the _Earth_.
Notwithstanding all which, should the sagacity of some eminent
philosopher be able to exhibit rules, whereby the quantity of the
variation may be computed for future times, yet then such a review, as
we have now made, will be necessary at a proper interval, to prove the
truth of them: and should no such rules appear, then will a continued
succession of such reviews be necessary so long as commerce and
navigation subsist among us.
What we have now done is intirely for the public service, the sale of
the former chart never having made good its expence; and we propose
to continue our endeavours for another review, at the proper time, if
we shall then be alive, and capable of the task: but as the contrary
may probably happen, we beg leave to conclude with recommending such
a continuation, in the strongest manner, to such of the members of
this Royal Society, or others, who may, at the proper intervals, have
leisure and ability for such a performance.
We are, with the greatest deference,
Your Lordship’s,
And the Royal Society’s,
Most faithful and
most obedient Servants,
William Mountaine.
James Dodson.
_A_ TABLE, _exhibiting the different Variations of the_ MAGNETIC-NEEDLE
_in the more frequented Oceans, from the Year 1700 to the Year 1756_.
| Longitude, | VARIATION.
| From | Anno | Anno | Anno | Anno |
Latitude. | London. | 1700. | 1710. | 1720. | 1730. |
----------+------------+----------+----------+----------+----------+
_Degrees._| _Degrees._ |_Degrees._|_Degrees._|_Degrees._|_Degrees._|
0 | 0 | 4½ W | | | 10¼ W |
0 | 5 W | 2¾ W | | | 8¾ W |
0 | 10 W | 1½ W | 3½ W | 5½ W | 7 W |
0 | 15 W | 0½ W | 2 W | 3½ W | 5 W |
0 | 20 W | 0¾ E | 0½ W | 1¾ W | 3 W |
0 | 25 W | 1½ E | 0½ E | 0½ W | 1½ W |
0 | 30 W | 2½ E | 2 E | 1½ E | 1 E |
0 | 35 W | 3¼ E | 3 E | 2¾ E | 2½ E |
0 | 40 W | 4¼ E | 4¼ E | 4 E | 3¾ E |
0 | 45 W | 5½ E | 5½ E | 5¼ E | 5 E |
0 | 50 W | 6¾ E | | | 5¾ E |
0 | 5 E | 6 W | | | 12½ W |
0 | 10 E | 7¾ W | | | 14¼ W |
0 | 40 E | 16¾ W | 17 W | 17¼ W | 17 W |
0 | 45 E | 17¾ W | 17¼ W | 16¾ W | 16¼ W |
0 | 50 E | 17½ W | 16¾ W | 16 W | 15 W |
0 | 55 E | 16½ W | 15¼ W | 14 W | 13 W |
0 | 60 E | 15¼ W | 13¾ W | 12½ W | 11 W |
0 | 65 E | 13½ W | 11¾ W | 10 W | 8¼ W |
0 | 70 E | 11½ W | 9¾ W | 7¾ W | 6 W |
0 | 75 E | 9¾ W | 7¾ W | 5¾ W | 4 W |
0 | 80 E | 7¾ W | 6 W | 4¼ W | 3 W |
0 | 85 E | 5½ W | 4 W | 2½ W | 1½ W |
0 | 90 E | 4¼ W | 3½ W | 1½ W | 0½ W |
0 | 95 E | 3¼ W | 2¼ W | | |
0 |100 E | 2½ W | 1 W | | |
5 N | 0 | 4¾ W | | | 10½ W |
5 N | 5 W | 3¼ W | | | 9 W |
5 N | 10 W | 1¾ W | | | 7½ W |
5 N | 15 W | 0¾ W | 2¼ W | 3¾ W | 5½ W |
5 N | 20 W | 0 | 1½ W | 2½ W | 3½ W |
5 N | 25 W | 1 E | 0 | 1 W | 2 W |
5 N | 30 W | 1¾ E | 1¼ E | 0½ E | 0¼ W |
5 N | 35 W | 2½ E | 2¼ E | 1¾ E | 1½ E |
5 N | 40 W | 3½ E | 3¼ E | 3 E | 2½ E |
5 N | 45 W | 4½ E | 4¼ E | 4¼ E | 4 E |
5 N | 50 W | 5½ E | 5½ E | 5¼ E | 5¼ E |
5 N | 55 W | 6¾ E | | | |
5 N | 5 E | 6¼ W | | | 12¾ W |
5 N | 10 E | 7¾ W | | | 14¼ W |
5 N | 45 E | 16¾ W | 16 W | 15¼ W | 14¾ W |
5 N | 50 E | 16¾ W | 15¾ W | 14¾ W | 13½ W |
5 N | 55 E | 15½ W | 14¼ W | 13 W | 12 W |
5 N | 60 E | 14¼ W | 12¾ W | 11¼ W | 10 W |
5 N | 65 E | 12¾ W | 11 W | 9½ W | 8 W |
5 N | 70 E | 10¾ W | 9 W | 7¼ W | 5½ W |
5 N | 75 E | 8¾ W | 7 W | 5¼ W | 3¾ W |
5 N | 80 E | 6½ W | 5 W | 3½ W | 2½ W |
5 N | 85 E | 4¾ W | 3¾ W | 2¾ W | 1½ W |
5 N | 90 E | 3¾ W | | | |
5 N | 95 E | 2¾ W | | | |
10 N | 15 W | 1¼ W | | 4½ W | 6 W |
10 N | 20 W | 0½ W | 2 W | 3¼ W | 4½ W |
10 N | 25 W | 0¼ E | 0¾ W | 1¾ W | 2¾ W |
10 N | 30 W | 1 E | 0½ E | 0 | 1 W |
10 N | 35 W | 1¾ E | 1¼ E | 0¾ E | 0¼ E |
10 N | 40 W | 2½ E | 2¼ E | 2 E | 1¾ E |
10 N | 45 W | 3½ E | 3½ E | 3¼ E | 3 E |
10 N | 50 W | 4½ E | 4½ E | 4¼ E | 4¼ E |
10 N | 55 W | 5½ E | 5½ E | 5½ E | 5¼ E |
10 N | 60 W | 6½ E | | | |
10 N | 50 E | 16 W | 15 W | 14 W | 12¾ W |
10 N | 55 E | 15 W | 13½ W | 12 W | 11 W |
10 N | 60 E | 13½ W | 12 W | 10½ W | 9¼ W |
10 N | 65 E | 12 W | 10¾ W | 9 W | 7½ W |
10 N | 70 E | 10 W | 8¾ W | 6½ W | 5 W |
10 N | 75 E | 8 W | 6½ W | 5 W | 3½ W |
10 N | 80 E | 5¾ W | 4½ W | 3¼ W | 2 W |
10 N | 85 E | 4½ W | 3½ W | 2¼ W | 1¼ W |
10 N | 90 E | 3½ W | | | |
10 N | 95 E | 2½ W | | | |
15 N | 20 W | 1 W | 2½ W | 4 W | 5½ W |
15 N | 25 W | 0½ W | 1½ W | 2½ W | 3½ W |
15 N | 30 W | 0¼ E | 0¼ W | 1 W | 1¾ W |
15 N | 35 W | 1 E | 0½ E | 0 | 0½ W |
15 N | 40 W | 1½ E | 1¾ E | 1 E | 0½ E |
15 N | 45 W | 2¼ E | 2¼ E | 2 E | 1¾ E |
15 N | 50 W | 3¼ E | 3¼ E | 3¼ E | 3 E |
15 N | 55 W | 4 E | 4 E | 4 E | 4 E |
15 N | 60 W | 5 E | 5 E | 5 E | 5 E |
15 N | 65 W | 6 E | | | 5 E |
15 N | 70 W | 7 E | | | 5½ E |
15 N | 75 W | 7¾ E | | | |
15 N | 80 W | 8¼ E | | | |
15 N | 50 E | 15½ W | 14¼ W | 13 W | 11¾ W |
15 N | 55 E | 14¼ W | 12¾ W | 11½ W | 10¾ W |
15 N | 60 E | 13 W | 11¾ W | 10¼ W | 9 W |
15 N | 65 E | 11½ W | 10 W | 8¾ W | 7½ W |
15 N | 70 E | 9¾ W | 8¼ W | 6¾ W | 5½ W |
15 N | 75 E | 8 W | 6½ W | 5 W | 3½ W |
15 N | 80 E | 5¾ W | 4½ W | 3½ W | 2½ W |
15 N | 85 E | 4¼ W | 3¼ W | 2¼ W | 1 W |
15 N | 90 E | 3¼ W | 2½ W | 1¼ W | |
15 N | 95 E | 2½ W | 1½ W | | |
20 N | 20 W | 1½ W | 3 W | 4¼ W | 5¼ W |
20 N | 25 W | 1 W | 2 W | 2¾ W | 3½ W |
20 N | 30 W | 0½ W | 1 W | 1½ W | 2¼ W |
20 N | 35 W | 0¼ E | 0¼ W | 0¾ W | 1½ W |
20 N | 40 W | 0¾ E | ¼ E | 0 | 0½ W |
20 N | 45 W | 1½ E | 1¼ E | 1 E | ¾ E |
20 N | 50 W | 2 E | 2 E | 1¾ E | 1½ E |
20 N | 55 W | 2¾ E | 2¾ E | 2¾ E | 2½ E |
20 N | 60 W | 3¾ E | 3¾ E | 3¾ E | 3½ E |
20 N | 65 W | 4¾ E | | | |
20 N | 70 W | 5½ E | | | |
20 N | 75 W | 6¼ E | | | |
20 N | 80 W | 7 E | | | |
20 N | 60 E | 12¾ W | 11¼ W | 10 W | 9 W |
20 N | 65 E | 11½ W | 10 W | 8½ W | 7¼ W |
20 N | 70 E | 9¾ W | 8½ W | 7 W | 5¾ W |
20 N | 90 E | 3½ W | 2½ W | 1½ W | 1 W |
25 N | 20 W | 2 W | 3¼ W | 4 W | 5¼ W |
25 N | 25 W | 1¾ W | 2¼ W | 2¾ W | 4 W |
25 N | 30 W | 1¼ W | 1¾ W | 2¼ W | 3 W |
25 N | 35 W | 1 W | 1½ W | 2 W | 2½ W |
25 N | 40 W | 0½ W | 0¾ W | 1 W | 1½ W |
25 N | 45 W | 0¼ E | 0 | 0½ W | 1 W |
25 N | 50 W | 0¾ E | 0½ E | 0¼ E | 0 |
25 N | 55 W | 1¼ E | 1 E | 1 E | ¾ E |
25 N | 60 W | 2 E | 2 E | 2 E | 1½ E |
25 N | 65 W | 2¾ E | | | |
25 N | 70 W | 3½ E | | | |
25 N | 75 W | 4¼ E | | | |
25 N | 80 W | 4¾ E | | | |
25 N | 60 E | 12¾ W | 11½ W | 10¼ W | 9 W |
25 N | 65 E | 11½ W | 10¼ W | 9 W | 7½ W |
25 N | 70 E | 10 W | 8¾ W | 7½ W | 6 W |
30 N | 10 W | 3½ W | | | |
30 N | 15 W | 3¼ W | | | |
30 N | 20 W | 3 W | 4¼ W | 5½ W | 6¾ W |
30 N | 25 W | 2¾ W | 3½ W | 4¼ W | 5½ W |
30 N | 30 W | 2½ W | 3 W | 3½ W | 4¼ W |
30 N | 35 W | 2¼ W | 2¾ W | 3¼ W | 3¾ W |
30 N | 40 W | 1¾ W | 2 W | 2½ W | 3 W |
30 N | 45 W | 1¼ W | 1½ W | 2 W | 2¼ W |
30 N | 50 W | 0¾ W | 1 W | 1½ W | 1¾ W |
30 N | 55 W | 0¼ W | ½ W | 1 W | 1¼ W |
30 N | 60 W | 0¼ E | 0 | ¼ W | 0½ W |
30 N | 65 W | 0¾ E | ½ E | ¼ E | 0 |
30 N | 70 W | 1½ E | 1¼ E | 1 E | ¾ E |
30 N | 75 W | 2 E | 1½ E | 1¼ E | 1 E |
30 N | 80 W | 2¼ E | | | |
35 N | 10 W | 4¼ W | | | 9¾ W |
35 N | 15 W | 4 W | | | 9¼ W |
35 N | 20 W | 4 W | | | 8¼ W |
35 N | 25 W | 3¾ W | 4¾ W | 6 W | 7½ W |
35 N | 30 W | 3¾ W | 4½ W | 5½ W | 6¾ W |
35 N | 35 W | 3¾ W | 4¼ W | 5¼ W | 6 W |
35 N | 40 W | 3¾ W | 4 W | 4½ W | 5¼ W |
35 N | 45 W | 3½ W | 3¾ W | 4¼ W | 4¾ W |
35 N | 50 W | 3½ W | 3¾ W | 4 W | 4¼ W |
35 N | 55 W | 3½ W | 3¾ W | 4 W | 4¼ W |
35 N | 60 W | 3¼ W | 3¾ W | 4 W | 4¼ W |
35 N | 65 W | 3 W | | | |
35 N | 70 W | 2½ W | | | |
35 N | 75 W | 2¼ W | | | |
40 N | 10 W | 5 W | | | 10¾ W |
40 N | 15 W | 5¼ W | | | 10½ W |
40 N | 20 W | 5¼ W | | | 10 W |
40 N | 25 W | 5½ W | | | 9½ W |
40 N | 30 W | 5½ W | 6¾ W | 8 W | 9 W |
40 N | 35 W | 5¾ W | 6½ W | 7¼ W | 8¼ W |
40 N | 40 W | 5¾ W | 6¼ W | 7¼ W | 8 W |
40 N | 45 W | 6 W | | | 7½ W |
40 N | 50 W | 6¼ W | | | 7¼ W |
40 N | 55 W | 6½ W | | | 7¾ W |
40 N | 60 W | 6¾ W | | | 8 W |
40 N | 65 W | 7 W | | | 8½ W |
40 N | 70 W | 7 W | | | 9 W |
45 N | 5 W | 6 W | | | 12½ W |
45 N | 10 W | 6½ W | | | 12¼ W |
45 N | 15 W | 6¾ W | | | 11¾ W |
45 N | 20 W | 7 W | | | 11½ W |
45 N | 25 W | 7½ W | | | 11½ W |
45 N | 30 W | 8 W | | | 11¾ W |
45 N | 35 W | 8¾ W | | | 11¾ W |
45 N | 40 W | 9½ W | | | 12 W |
45 N | 45 W | 10½ W | | | 12¾ W |
45 N | 50 W | 11½ W | | | 13½ W |
45 N | 55 W | 12½ W | | | 14 W |
45 N | 60 W | 13¾ W | | | 14 W |
50 N | 5 W | 7½ W | | | |
50 N | 10 W | 7¾ W | | | |
50 N | 15 W | 8½ W | | | |
50 N | 20 W | 9 W | | | |
50 N | 25 W | 9¾ W | | | |
5 S | 0 | 4¼ W | | | 10 W |
5 S | 5 W | 2½ W | | | 8½ W |
5 S | 10 W | 1 W | 3 W | 4¾ W | 6½ W |
5 S | 15 W | 0 | 1½ W | 3 W | 4½ W |
5 S | 20 W | 1¼ E | 0¼ W | 0¾ W | 2¼ W |
5 S | 25 W | 2¼ E | 1¼ E | 0¼ E | 0¾ W |
5 S | 30 W | 3¼ E | 2¼ E | 1¾ E | 1 E |
5 S | 35 W | 4¼ E | 4 E | 3½ E | 3¼ E |
5 S | 5 E | 6 W | | | 12½ W |
5 S | 10 E | 7½ W | | | 14¼ W |
5 S | 40 E | 18 W | 17¾ W | 17¾ W | 17½ W |
5 S | 45 E | 18½ W | 18¼ W | 18 W | 17½ W |
5 S | 50 E | 18½ W | 17¾ W | 17 W | 16¼ W |
5 S | 55 E | 17½ W | 16½ W | 15½ W | 14¾ W |
5 S | 60 E | 16¼ W | 14¾ W | 13¼ W | 12 W |
5 S | 65 E | 14¾ W | 12¾ W | 10¾ W | 9 W |
5 S | 70 E | 13 W | 11 W | 9 W | 6¾ W |
5 S | 75 E | 11 W | 9 W | 7 W | 5 W |
5 S | 80 E | 9 W | 7 W | 5 W | 3 W |
5 S | 85 E | 7 W | 5½ W | 3¾ W | 2½ W |
5 S | 90 E | 5 W | 4½ W | 2¾ W | 2 W |
5 S | 95 E | 3¾ W | 3½ W | 1½ W | 1½ W |
5 S |100 E | 3 W | 2½ W | 1½ W | 1 W |
10 S | 0 | 3¾ W | | | 9½ W |
10 S | 5 W | 2¼ W | 4¼ W | 6¼ W | 8¼ W |
10 S | 10 W | 0¾ W | 2¾ W | 4¾ W | 6½ W |
10 S | 15 W | ½ E | 1 W | 2½ W | 4 W |
10 S | 20 W | 1¾ E | 0½ E | 0 | 1½ W |
10 S | 25 W | 3 E | 2½ E | 1¾ E | 0¾ E |
10 S | 30 W | 4 E | 3½ E | 3 E | 2½ E |
10 S | 35 W | 5¼ E | 5 E | 4¾ E | 4½ W |
10 S | 5 E | 5¾ W | | | 12 W |
10 S | 10 E | 7½ W | | | 14 W |
10 S | 15 E | 9¼ W | | | 15½ W |
10 S | 40 E | 18¾ W | 18¾ W | 18¾ W | 18¾ W |
10 S | 45 E | 19½ W | 19¼ W | 19 W | 18¾ W |
10 S | 50 E | 19½ W | 19 W | 18½ W | 17¾ W |
10 S | 55 E | 18½ W | 17½ W | 16½ W | 15½ W |
10 S | 60 E | 17 W | 16 W | 15 W | 14 W |
10 S | 65 E | 15¾ W | 13¾ W | 11¾ W | 10 W |
10 S | 70 E | 14½ W | 12 W | 10 W | 8 W |
10 S | 75 E | 12½ W | 10¼ W | 9 W | 5¾ W |
10 S | 80 E | 10½ W | 8 W | 5½ W | 4 W |
10 S | 85 E | 8½ W | 6¾ W | 5 W | 3¾ W |
10 S | 90 E | 6¾ W | 5½ W | 4¼ W | 3 W |
10 S | 95 E | 5 W | 4½ W | 4 W | 3¼ W |
10 S |100 E | 3¾ W | 3½ W | 3¼ W | 3 W |
10 S |105 E | 2¾ W | 2¾ W | 2½ W | 2½ W |
10 S |110 E | 2 W | | | |
15 S | 0 | 3½ W | 5½ W | 7½ W | 9½ W |
15 S | 5 W | 1¾ W | 3¾ W | 5¾ W | 7¾ W |
15 S | 10 W | ¼ W | 2 W | 3¾ W | 5½ W |
15 S | 15 W | 1¼ E | 0¼ W | 1¾ W | 3¼ W |
15 S | 20 W | 2½ E | 1½ E | 0¾ E | 0½ W |
15 S | 25 W | 3¾ E | 3 E | 2¼ E | 1½ E |
15 S | 30 W | 5 E | 4½ E | 4 E | 3½ E |
15 S | 35 W | 6½ E | 6¼ E | 5¾ E | 5½ E |
15 S | 40 W | 7¾ E | | | |
15 S | 5 E | 5½ W | | | 11½ W |
15 S | 10 E | 7½ W | | | 14 W |
15 S | 40 E | 19¾ W | 19¾ W | 20 W | 20 W |
15 S | 45 E | 20½ W | 20½ W | 20¼ W | 20¼ W |
15 S | 50 E | 20½ W | 20 W | 19½ W | 18¾ W |
15 S | 55 E | 19½ W | 18½ W | 17½ W | 16½ W |
15 S | 60 E | 18¼ W | 17 W | 16 W | 14½ W |
15 S | 65 E | 17 W | 15½ W | 13½ W | 12 W |
15 S | 70 E | 15½ W | 12¾ W | 10¾ W | 9 W |
15 S | 75 E | 14 W | 12 W | 9¾ W | 7½ W |
15 S | 80 E | 12 W | 10 W | 8 W | 6 W |
15 S | 85 E | 10 W | 8 W | 6¼ W | 4¾ W |
15 S | 90 E | 8½ W | 7¼ W | 6 W | 4½ W |
15 S | 95 E | 6½ W | 5¾ W | 5 W | 4¼ W |
15 S |100 E | 5 W | 4¾ W | 4½ W | 4¼ W |
15 S |105 E | 3½ W | 3½ W | 3¾ W | 3¾ W |
15 S |110 E | 2½ W | | | |
20 S | 0 | 3¼ W | 5¼ W | 7¼ W | 9 W |
20 S | 5 W | 1½ W | 3¼ W | 5 W | 6¾ W |
20 S | 10 W | 0½ E | 1¼ W | 3 W | 4¾ W |
20 S | 15 W | 1¾ E | 0½ E | 0¾ W | 2 W |
20 S | 20 W | 3 E | 2¾ E | 1½ E | 0½ W |
20 S | 25 W | 4¾ E | 4¼ E | 3½ E | 2¾ E |
20 S | 30 W | 6 E | 5½ E | 5¼ E | 4¾ E |
20 S | 35 W | 7¾ E | 7½ E | 7¼ E | 6¾ E |
20 S | 40 W | 9¼ E | | | |
20 S | 5 E | 5½ W | | | 11 W |
20 S | 10 E | 7½ W | | | 13½ W |
20 S | 15 E | 9½ W | | | 15½ W |
20 S | 35 E | 19 W | 19¼ W | 19¾ W | 20¼ W |
20 S | 40 E | 20½ W | 20¾ W | 21¼ W | 21½ W |
20 S | 45 E | 21¼ W | 21¼ W | 21½ W | 21½ W |
20 S | 50 E | 21¼ W | 21 W | 20¾ W | 20¼ W |
20 S | 55 E | 20½ W | 20 W | 19¼ W | 18½ W |
20 S | 60 E | 19½ W | 18¼ W | 17 W | 5¾ W |
20 S | 65 E | 18¼ W | 17 W | 15¾ W | 14¼ W |
20 S | 70 E | 16¾ W | 15½ W | 13½ W | 12 W |
20 S | 75 E | 15 W | 13 W | 10½ W | 9 W |
20 S | 80 E | 13½ W | 11¾ W | 9¾ W | 8 W |
20 S | 85 E | 11½ W | 10 W | 8½ W | 7 W |
20 S | 90 E | 10 W | 8¾ W | 7½ W | 6¼ W |
20 S | 95 E | 8 W | 7¼ W | 6½ W | 5¾ W |
20 S |100 E | 6½ W | 6¼ W | 6 W | 5½ W |
20 S |105 E | 4¾ W | 5 W | 5 W | 5 W |
25 S | 0 | 3 W | 5 W | 7 W | 8¾ W |
25 S | 5 W | 1 W | 2¾ W | 4½ W | 6¼ W |
25 S | 10 W | 1 E | 0½ W | 2¾ W | 4 W |
25 S | 15 W | 2½ E | 1¼ W | 0 | 1¼ W |
25 S | 20 W | 4 E | 3¼ E | 2 E | 1¼ E |
25 S | 25 W | 6 E | 5¼ E | 4½ E | 3¾ E |
25 S | 30 W | 7½ E | 7 E | 6½ E | 6 E |
25 S | 35 W | 9¼ E | | | |
25 S | 40 W | 11 E | | | |
25 S | 5 E | 5¼ W | 7 W | 8¾ W | 10½ W |
25 S | 10 E | 7½ W | | | |
25 S | 15 E | 9½ W | | | |
25 S | 35 E | 19½ W | 20¼ W | 20¾ W | 21½ W |
25 S | 40 E | 21 W | 21½ W | 22 W | 22½ W |
25 S | 45 E | 22¼ W | 22½ W | 22¾ W | 23 W |
25 S | 50 E | 22½ W | 22½ W | 22¼ W | 22¼ W |
25 S | 55 E | 22 W | 21½ W | 21 W | 20½ W |
25 S | 60 E | 20¾ W | 19¾ W | 19 W | 18¼ W |
25 S | 65 E | 19¼ W | 18¼ W | 17¼ W | 16¼ W |
25 S | 70 E | 17¾ W | 16¾ W | 15¾ W | 14½ W |
25 S | 75 E | 16¼ W | 15 W | 13¾ W | 12½ W |
25 S | 80 E | 14¾ W | 13½ W | 12¼ W | 10¾ W |
25 S | 85 E | 13 W | 11¾ W | 10½ W | 9¼ W |
25 S | 90 E | 11¼ W | 10¼ W | 9¾ W | 8¼ W |
25 S | 95 E | 9½ W | 9 W | 8½ W | 7¾ W |
25 S |100 E | 7¾ W | 7½ W | 7¼ W | 7 W |
30 S | 0 | 2¾ W | 4¼ W | 6 W | 7¾ W |
30 S | 5 W | 0½ W | 2 W | 3½ W | 5¼ W |
30 S | 10 W | 1½ E | 0 | 1½ W | 3 W |
30 S | 15 W | 3¼ E | 2¼ E | 0¾ E | 0¼ W |
30 S | 20 W | 5 E | 4¾ E | 3¾ E | 2¾ E |
30 S | 25 W | 7¼ E | 6½ E | 5¾ E | 5 E |
30 S | 30 W | 9 E | | | |
30 S | 35 W | 11 E | | | |
30 S | 5 E | 5 W | 7 W | 8¾ W | 10¼ W |
30 S | 10 E | 7¼ W | 9¼ W | 11¼ W | 12¾ W |
30 S | 15 E | 9½ W | | | |
30 S | 30 E | 17½ W | 18½ W | 19½ W | 20½ W |
30 S | 35 E | 20¼ W | 21 W | 21¾ W | 22½ W |
30 S | 40 E | 21¾ W | 22½ W | 23¼ W | 24 W |
30 S | 45 E | 23 W | 23½ W | 24 W | 24½ W |
30 S | 50 E | 23½ W | 23¾ W | 24 W | 24¼ W |
30 S | 55 E | 23 W | 23 W | 23 W | 22¾ W |
30 S | 60 E | 21¾ W | 21½ W | 21 W | 20½ W |
30 S | 65 E | 20¼ W | 19½ W | 19 W | 18½ W |
30 S | 70 E | 18¾ W | 18 W | 17¼ W | 16½ W |
30 S | 75 E | 17¼ W | 16½ W | 15¾ W | 14¾ W |
30 S | 80 E | 15¾ W | 15 W | 14 W | 13 W |
30 S | 85 E | 14 W | 13¼ W | 12½ W | 11½ W |
30 S | 90 E | 12½ W | 11¾ W | 11 W | 10¼ W |
30 S | 95 E | 10½ W | 10 W | 9½ W | 9¾ W |
30 S |100 E | 8¾ W | | | |
35 S | 0 | 2½ W | 4 W | 5½ W | 7 W |
35 S | 5 W | 0 | 1 W | 2½ W | 4 W |
35 S | 10 W | 2¼ E | 1½ E | 0½ W | 1¾ W |
35 S | 15 W | 4¼ E | | | |
35 S | 20 W | 6¾ E | | | |
35 S | 25 W | 8¾ E | | | |
35 S | 30 W | 10¾ E | | | |
35 S | 35 W | 12¾ E | | | |
35 S | 5 E | 5 W | 6½ W | 8 W | 9½ W |
35 S | 10 E | 7¼ W | 8½ W | 10¼ W | 11¾ W |
35 S | 15 E | 9¾ W | 11¼ W | 12¾ W | 14¼ W |
35 S | 20 E | 12½ W | 14 W | 15½ W | 17 W |
35 S | 25 E | 15¼ W | 16½ W | 18 W | 19¼ W |
35 S | 30 E | 18¼ W | 19½ W | 20½ W | 21½ W |
35 S | 35 E | 21 W | 22 W | 22¾ W | 23½ W |
35 S | 40 E | 22¾ W | 23½ W | 24¼ W | 25 W |
35 S | 45 E | 24¼ W | 25 W | 25 W | 26 W |
35 S | 50 E | 24¾ W | 25¼ W | 25¾ W | 26 W |
35 S | 55 E | 24¼ W | 24½ W | 24½ W | 24¾ W |
35 S | 60 E | 23 W | 23 W | 23 W | 22¾ W |
35 S | 65 E | 21½ W | 21¼ W | 21 W | 20¾ W |
35 S | 70 E | 19¾ W | 19¾ W | 18¾ W | 18¼ W |
35 S | 75 E | 18¼ W | 17¾ W | 17¼ W | 17½ W |
35 S | 80 E | 16¾ W | 16¼ W | 15¾ W | 15 W |
35 S | 85 E | 15 W | 14½ W | 14 W | 13½ W |
35 S | 90 E | 13½ W | 13 W | 12¾ W | 12½ W |
35 S | 95 E | 11½ W | 11½ W | 11¼ W | 11 W |
40 S | 0 | 2 W | 3½ W | 5 W | 6½ W |
40 S | 5 W | 0¾ E | 0½ W | 2 W | 3½ W |
40 S | 10 W | 3¼ E | | | |
40 S | 15 W | 5½ E | | | |
40 S | 20 W | 8 E | | | |
40 S | 25 W | 10½ E | | | |
40 S | 30 W | 12½ E | | | |
40 S | 5 E | 4½ W | 6 W | 7½ W | 9 W |
40 S | 10 E | 7¼ W | 8½ W | 10 W | 11½ W |
40 S | 15 E | 9¾ W | 11¼ W | 12¾ W | 14 W |
40 S | 20 E | 12¾ W | 14¼ W | 15½ W | 17 W |
40 S | 25 E | 16 W | 17¼ W | 18½ W | 19¾ W |
40 S | 30 E | 19 W | 20 W | 21¼ W | 22¼ W |
40 S | 35 E | 21¾ W | 22¾ W | 23½ W | 24½ W |
40 S | 40 E | 23¾ W | 24½ W | 25 W | 26 W |
40 S | 45 E | 25¼ W | 26 W | 26¾ W | 27½ W |
40 S | 50 E | 26 W | 26½ W | 27 W | 27½ W |
40 S | 55 E | 25¼ W | 25½ W | 25¾ W | 26 W |
40 S | 60 E | 24 W | 24 W | 24 W | 24¼ W |
40 S | 65 E | 22½ W | 22½ W | 22¼ W | 22¼ W |
40 S | 70 E | 20¾ W | 20½ W | 20¼ W | 20 W |
40 S | 75 E | 19¼ W | 18¾ W | 18¼ W | 17¾ W |
40 S | 80 E | 17½ W | 17 W | 16½ W | 16 W |
| Longitude, VARIATION.
| From | Anno | Anno
Latitude. | London. | 1744. | 1756.
--------------+----------------+----------+------------+
_Degrees._ | _Degrees._ |_Degrees._|_ Degrees._ |
0 | 0 |14¼ W | 15¼ W |
0 | 5 W |12 W | 13¼ W |
0 | 10 W |10 W | 11 W |
0 | 15 W | 7½ W | 9 W |
0 | 20 W | 5¼ W | 6½ W |
0 | 25 W | 3 W | 4 W |
0 | 30 W | 0¾ W | 0½ W |
0 | 35 W | 1½ E | 1½ E |
0 | 40 W | 3½ E | 3½ E |
0 | 45 W | 4¾ E | 5 E |
0 | 50 W | 6 E | 6½ E |
0 | 5 E |15¾ W | 16½ W |
0 | 10 E |17 W | 17½ W |
0 | 40 E |16½ W | 16¾ W |
0 | 45 E |15¾ W | 14½ W |
0 | 50 E |14 W | 11¾ W |
0 | 55 E |11½ W | 8¾ W |
0 | 60 E | 9 W | 6 W |
0 | 65 E | 6½ W | 4½ W |
0 | 70 E | 4 W | 2¾ W |
0 | 75 E | 1¾ W | 1 W |
0 | 80 E | 0¼ W | 0¼ E |
0 | 85 E | 0¼ E | 1¼ E |
0 | 90 E | 1¼ W | 1 E |
0 | 95 E | 2 W | 0½ W |
0 |100 E | 2½ W | 1 W |
5 N | 0 |15 W | 15¼ W |
5 N | 5 W |13 W | 13 W |
5 N | 10 W |10¾ W | 11¼ W |
5 N | 15 W | 8½ W | 9¼ W |
5 N | 20 W | 6 W | 7¼ W |
5 N | 25 W | 3¾ W | 4½ W |
5 N | 30 W | 1½ W | 1½ W |
5 N | 35 W | 0½ E | 0½ E |
5 N | 40 W | 2¼ E | 2¼ E |
5 N | 45 W | 3¾ E | 4 E |
5 N | 50 W | 5 E | 5¼ E |
5 N | 55 W | 6¼ E | 6½ E |
5 N | 5 E |16¼ W | 16½ W |
5 N | 10 E |17½ W | 17½ W |
5 N | 45 E |14 W | 13¾ W |
5 N | 50 E |12¼ W | 11 W |
5 N | 55 E |10 W | 8¼ W |
5 N | 60 E | 8¼ W | 6 W |
5 N | 65 E | 6 W | 4½ W |
5 N | 70 E | 3¾ W | 2¾ W |
5 N | 75 E | 1¾ W | 0¾ W |
5 N | 80 E | 0¼ W | 0¼ E |
5 N | 85 E | 0¼ W | 1¼ E |
5 N | 90 E | 1¼ W | 0½ E |
5 N | 95 E | 2¼ W | 0½ W |
10 N | 15 W | 9¼ W | 10 W |
10 N | 20 W | 7 W | 8 W |
10 N | 25 W | 4½ W | 5½ W |
10 N | 30 W | 2¼ W | 3 W |
10 N | 35 W | 0½ W | 1 W |
10 N | 40 W | 1¼ E | 1 E |
10 N | 45 W | 2¾ E | 2½ E |
10 N | 50 W | 4 E | 4 E |
10 N | 55 W | 5¼ E | 5½ E |
10 N | 60 W | 6½ E | 6¾ E |
10 N | 50 E |11¼ W | 10½ W |
10 N | 55 E | 9¼ W | 8 W |
10 N | 60 E | 7¾ W | 6 W |
10 N | 65 E | 6 W | 4½ W |
10 N | 70 E | 3¾ W | 3 W |
10 N | 75 E | 1¾ W | 1 E |
10 N | 80 E | 0½ W | 0¼ E |
10 N | 85 E | 0 | 1 E |
10 N | 90 E | 1½ W | 0½ E |
10 N | 95 E | 2¼ W | 0½ W |
15 N | 20 W | 7 W | 9 W |
15 N | 25 W | 4¾ W | 6½ W |
15 N | 30 W | 2¾ W | 4½ W |
15 N | 35 W | 1¼ W | 2½ W |
15 N | 40 W | 0 | 0½ W |
15 N | 45 W | 1½ E | 1 E |
15 N | 50 W | 2¾ E | 2½ E |
15 N | 55 W | 4 E | 3¾ E |
15 N | 60 W | 5 E | 5 E |
15 N | 65 W | 6 E | 6 E |
15 N | 70 W | 6¾ E | 7 E |
15 N | 75 W | 7 E | 7¾ E |
15 N | 80 W | 7 E | 8 E |
15 N | 50 E |10½ W | 9¾ W |
15 N | 55 E | 8¾ W | 7¾ W |
15 N | 60 E | 7½ W | 6 W |
15 N | 65 E | 6 W | 4½ W |
15 N | 70 E | 4 W | 2¾ W |
15 N | 75 E | 2¼ W | 0¾ W |
15 N | 80 E | 1¼ W | 0 |
15 N | 85 E | 0¼ W | 0¾ W |
15 N | 90 E | 0¾ W | 0½ W |
15 N | 95 E | 2¼ W | 0½ W |
20 N | 20 W | 7 W | 10 W |
20 N | 25 W | 4¾ W | 8 W |
20 N | 30 W | 3¼ W | 5¾ W |
20 N | 35 W | 2¼ W | 4 W |
20 N | 40 W | 1 W | 2½ W |
20 N | 45 W | 0¼ E | 0¾ W |
20 N | 50 W | 1¼ E | 0¾ E |
20 N | 55 W | 2½ E | 2 E |
20 N | 60 W | 3½ E | 3¼ E |
20 N | 65 W | 4¼ E | 4 E |
20 N | 70 W | 5 E | 5 E |
20 N | 75 W | 5¼ E | 5¼ E |
20 N | 80 W | 5¼ E | 6 E |
20 N | 60 E | 7½ W | 6 W |
20 N | 65 E | 6 W | 4½ W |
20 N | 70 E | 4½ W | 2¾ W |
20 N | 90 E | 0½ W | 1 E |
25 N | 20 W | 7 W | 11 W |
25 N | 25 W | 5¼ W | 9½ W |
25 N | 30 W | 4 W | 7½ W |
25 N | 35 W | 3 W | 5½ W |
25 N | 40 W | 2¼ W | 3¾ W |
25 N | 45 W | 1½ W | 2½ W |
25 N | 50 W | 0½ W | 1 W |
25 N | 55 W | 0½ E | 0 |
25 N | 60 W | 1½ E | 1¼ E |
25 N | 65 W | 2¼ E | 2¼ E |
25 N | 70 W | 3¼ E | 2¾ E |
25 N | 75 W | 3½ E | 3 E |
25 N | 80 W | 3½ E | 3 E |
25 N | 60 E | 7½ W | 6 W |
25 N | 65 E | 6 W | 4½ W |
25 N | 70 E | 4½ W | 2¾ W |
30 N | 10 W |11½ W | 13¾ W |
30 N | 15 W |10¼ W | 12¾ W |
30 N | 20 W | 8½ W | 12 W |
30 N | 25 W | 6¾ W | 10¾ W |
30 N | 30 W | 5¼ W | 9 W |
30 N | 35 W | 4¼ W | 7 W |
30 N | 40 W | 3½ W | 5¼ W |
30 N | 45 W | 2¾ W | 4 W |
30 N | 50 W | 2¼ W | 3 W |
30 N | 55 W | 1½ W | 2¼ W |
30 N | 60 W | 1 W | 1½ W |
30 N | 65 W | ¼ W | 1 W |
30 N | 70 W | ¼ E | ½ W |
30 N | 75 W | ½ E | 0 |
30 N | 80 W | ¾ E | 0 |
35 N | 10 W |12¼ W | 14¾ W |
35 N | 15 W |11½ W | 13¾ W |
35 N | 20 W |10¼ W | 13 W |
35 N | 25 W | 9 W | 12¼ W |
35 N | 30 W | 8 W | 10½ W |
35 N | 35 W | 7 W | 8¾ W |
35 N | 40 W | 6¼ W | 7¼ W |
35 N | 45 W | 5½ W | 6¼ W |
35 N | 50 W | 5 W | 5½ W |
35 N | 55 W | 4¾ W | 5 W |
35 N | 60 W | 5 W | 5¼ W |
35 N | 65 W | 5¼ W | 6 W |
35 N | 70 W | 5¾ W | 6¾ W |
35 N | 75 W | 6½ W | 7 W |
40 N | 10 W |13¼ W | 15 W |
40 N | 15 W |12¾ W | 14½ W |
40 N | 20 W |12¼ W | 14¼ W |
40 N | 25 W |11¼ W | 13½ W |
40 N | 30 W |10¼ W | 12¾ W |
40 N | 35 W | 9½ W | 11¼ W |
40 N | 40 W | 9 W | 10 W |
40 N | 45 W | 8½ W | 9½ W |
40 N | 50 W | 8½ W | 9½ W |
40 N | 55 W | 8¾ W | 10 W |
40 N | 60 W | 9¼ W | 11 W |
40 N | 65 W |10¼ W | 12 W |
40 N | 70 W |11½ W | 12¾ W |
45 N | 5 W |15½ W | 16½ W |
45 N | 10 W |15 W | 16½ W |
45 N | 15 W |14¾ W | 16¼ W |
45 N | 20 W |14½ W | 16 W |
45 N | 25 W |14 W | 16 W |
45 N | 30 W |13¾ W | 15¾ W |
45 N | 35 W |13¼ W | 15¼ W |
45 N | 40 W |13 W | 15 W |
45 N | 45 W |13¼ W | 15½ W |
45 N | 50 W |14 W | 16 W |
45 N | 55 W |15¼ W | 17 W |
45 N | 60 W |16 W | 18½ W |
50 N | 5 W |17 W | 19¼ W |
50 N | 10 W |17¼ W | 19½ W |
50 N | 15 W |17½ W | 20 W |
50 N | 20 W |17½ W | 20½ W |
50 N | 25 W |17¾ W | 21 W |
5 S | 0 |13¼ W | 15 W |
5 S | 5 W |11¼ W | 13 W |
5 S | 10 W | 9¼ | 10¾ W |
5 S | 15 W | 6¾ W | 8½ W |
5 S | 20 W | 4 W | 6 W |
5 S | 25 W | 2 W | 3 W |
5 S | 30 W | 0¼ E | 0 |
5 S | 35 W | 2¾ E | 2¾ E |
5 S | 5 E |15 W | 16 W |
5 S | 10 E |16½ W | 17 W |
5 S | 40 E |17½ W | 18 W |
5 S | 45 E |17 W | 16 W |
5 S | 50 E |15½ W | 12¾ W |
5 S | 55 E |13 W | 9¼ W |
5 S | 60 E |10 W | 6½ W |
5 S | 65 E | 7 W | 4½ W |
5 S | 70 E | 4½ W | 3 W |
5 S | 75 E | 2¼ W | 1 W |
5 S | 80 E | 0¾ W | 0 |
5 S | 85 E | 0½ W | 0¾ E |
5 S | 90 E | 1¼ W | 0¾ E |
5 S | 95 E | 2 W | 0½ W |
5 S |100 E | 2¾ W | 1½ W |
10 S | 0 |12½ W | 14¼ W |
10 S | 5 W |10½ W | 12¾ W |
10 S | 10 W | 8¼ W | 10¼ W |
10 S | 15 W | 5¾ W | 7¾ W |
10 S | 20 W | 3 W | 4¾ W |
10 S | 25 W | 0¾ W | 2 W |
10 S | 30 W | 1¾ E | 1 E |
10 S | 35 W | 4 E | 3½ E |
10 S | 5 E |14½ W | 15¾ W |
10 S | 10 E |16 W | 16¾ W |
10 S | 15 E |17¼ W | 17¾ W |
10 S | 40 E |19 W | 19¼ W |
10 S | 45 E |18½ W | 18 W |
10 S | 50 E |16¾ W | 14¼ W |
10 S | 55 E |14½ W | 10½ W |
10 S | 60 E |11¼ W | 7¼ W |
10 S | 65 E | 8 W | 5 W |
10 S | 70 E | 5½ W | 3½ W |
10 S | 75 E | 3½ W | 2 W |
10 S | 80 E | 1¾ W | 1 W |
10 S | 85 E | 1½ W | 0¼ W |
10 S | 90 E | 1¾ W | 0¼ W |
10 S | 95 E | 2½ W | 1 W |
10 S |100 E | 2¾ W | 2 W |
10 S |105 E | 3¼ W | 2¾ W |
10 S |110 E | 3¾ W | 3¼ W |
15 S | 0 |11¾ W | 14 W |
15 S | 5 W | 9½ W | 12 W |
15 S | 10 W | 7½ W | 9½ W |
15 S | 15 W | 4¾ W | 7 W |
15 S | 20 W | 1¾ W | 4 W |
15 S | 25 W | 0½ E | 1 W |
15 S | 30 W | 3 E | 2 E |
15 S | 35 W | 5 E | 4½ E |
15 S | 40 W | 6¾ E | 6½ E |
15 S | 5 E |13¾ W | 15¼ W |
15 S | 10 E |15½ W | 16½ W |
15 S | 40 E |20 W | 20 W |
15 S | 45 E |20 W | 19½ W |
15 S | 50 E |18 W | 16¼ W |
15 S | 55 E |15½ W | 12½ W |
15 S | 60 E |12½ W | 9 W |
15 S | 65 E | 9¾ W | 6 W |
15 S | 70 E | 7¼ W | 4¼ W |
15 S | 75 E | 5 W | 3¼ W |
15 S | 80 E | 3½ W | 2½ W |
15 S | 85 E | 2¾ W | 2¼ W |
15 S | 90 E | 3 W | 2¼ W |
15 S | 95 E | 3¼ W | 2¾ W |
15 S |100 E | 3¾ W | 3½ W |
15 S |105 E | 4¼ W | 3¾ W |
15 S |110 E | 4½ W | |
20 S | 0 |11 W | 13½ W |
20 S | 5 W | 8¾ W | 11¼ W |
20 S | 10 W | 6½ W | 8¾ W |
20 S | 15 W | 3½ W | 5¾ W |
20 S | 20 W | 0½ W | 3 W |
20 S | 25 W | 2 E | 0 |
20 S | 30 W | 4¼ E | 2½ E |
20 S | 35 W | 6½ E | 5 E |
20 S | 40 W | 8 E | 7½ E |
20 S | 5 E |13¼ W | 15 W |
20 S | 10 E |15 W | 16¼ W |
20 S | 15 E |16½ W | 17¾ W |
20 S | 35 E |20¾ W | 22 W |
20 S | 40 E |21¾ W | 22 W |
20 S | 45 E |21¾ W | 21¼ W |
20 S | 50 E |19¾ W | 18¾ W |
20 S | 55 E |17 W | 15 W |
20 S | 60 E |14½ W | 11¼ W |
20 S | 65 E |12 W | 8 W |
20 S | 70 E |10 W | 6 W |
20 S | 75 E | 7¾ W | 4¾ W |
20 S | 80 E | 6 W | 4½ W |
20 S | 85 E | 5 W | 4¼ W |
20 S | 90 E | 4¾ W | 4½ W |
20 S | 95 E | 4¾ W | 4½ W |
20 S |100 E | 5 W | 4¾ W |
20 S |105 E | 5 W | 4¾ W |
25 S | 0 |10½ W | 12½ W |
25 S | 5 W | 8 W | 10 W |
25 S | 10 W | 5½ W | 7½ W |
25 S | 15 W | 2½ W | 4½ W |
25 S | 20 W | 0½ E | 2¾ W |
25 S | 25 W | 3 E | 1 E |
25 S | 30 W | 5½ E | 3½ E |
25 S | 35 W | 7½ E | 6 E |
25 S | 40 W | 9 E | |
25 S | 5 E |12½ W | 14½ W |
25 S | 10 E |14½ W | 16 W |
25 S | 15 E |16¼ W | 17¾ W |
25 S | 35 E |22¼ W | 23½ W |
25 S | 40 E |23¼ W | 23¾ W |
25 S | 45 E |23¼ W | 23 W |
25 S | 50 E |22 W | 21 W |
25 S | 55 E |19¾ W | 18 W |
25 S | 60 E |17 W | 14¾ W |
25 S | 65 E |15 W | 11¾ W |
25 S | 70 E |13 W | 9½ W |
25 S | 75 E |11¼ W | 8 W |
25 S | 80 E | 9¼ W | 7½ W |
25 S | 85 E | 8 W | 7¼ W |
25 S | 90 E | 7¼ W | 7 W |
25 S | 95 E | 7 W | 6½ W |
25 S |100 E | 6¾ W | 6 W |
30 S | 0 | 9½ W | 11¾ W |
30 S | 5 W | 7 W | 9 W |
30 S | 10 W | 4½ W | 6¼ W |
30 S | 15 W | 1½ W | 3½ W |
30 S | 20 W | 1½ E | 0½ W |
30 S | 25 W | 4 E | 2 E |
30 S | 30 W | 6½ E | 4½ E |
30 S | 35 W | 8½ E | 7¼ E |
30 S | 5 E |11¾ W | 13¾ W |
30 S | 10 E |14 W | 15½ W |
30 S | 15 E |16 W | 17½ W |
30 S | 30 E |21¾ W | 23¼ W |
30 S | 35 E |23½ W | 24¾ W |
30 S | 40 E |24¾ W | 25¼ W |
30 S | 45 E |25¼ W | 24½ W |
30 S | 50 E |24½ W | 23¼ W |
30 S | 55 E |22½ W | 21 W |
30 S | 60 E |20 W | 18 W |
30 S | 65 E |17¾ W | 15 W |
30 S | 70 E |15½ W | 13 W |
30 S | 75 E |13¾ W | 11½ W |
30 S | 80 E |12 W | 10¾ W |
30 S | 85 E |10½ W | 10¼ W |
30 S | 90 E | 9½ W | 9½ W |
30 S | 95 E | 8¾ W | 9 W |
30 S |100 E | 8¼ W | |
35 S | 0 | 8½ W | 10½ W |
35 S | 5 W | 5¾ W | 7¾ W |
35 S | 10 W | 3¼ W | 5 W |
35 S | 15 W | 0¼ W | 2¼ W |
35 S | 20 W | 2½ E | 0½ E |
35 S | 25 W | 5 E | 3 E |
35 S | 30 W | 7¼ E | 5¾ E |
35 S | 35 W | 9¼ E | 8¼ E |
35 S | 5 E |11 W | 13 W |
35 S | 10 E |13½ W | 15¼ W |
35 S | 15 E |15½ W | 17½ W |
35 S | 20 E |18½ W | 19¾ W |
35 S | 25 E |20¾ W | 22½ W |
35 S | 30 E |22¾ W | 24¼ W |
35 S | 35 E |24½ W | 26 W |
35 S | 40 E |26 W | 26¾ W |
35 S | 45 E |27 W | 26 W |
35 S | 50 E |26½ W | 24¾ W |
35 S | 55 E |25 W | 23 W |
35 S | 60 E |22¾ W | 21 W |
35 S | 65 E |20¼ W | 18¾ W |
35 S | 70 E |17¾ W | 16¾ W |
35 S | 75 E |16 W | 15¼ W |
35 S | 80 E |14¼ W | 14¼ W |
35 S | 85 E |13 W | 13½ W |
35 S | 90 E |12 W | 12¾ W |
35 S | 95 E |10¾ W | |
40 S | 0 | 7¾ W | 9¼ W |
40 S | 5 W | 5 W | 6¾ W |
40 S | 10 W | 2½ W | 4¼ W |
40 S | 15 W | 0½ E | 1½ W |
40 S | 20 W | 3¼ E | 1¼ E |
40 S | 25 W | 5½ E | 4 E |
40 S | 30 W | 8 E | 6½ E |
40 S | 5 E |10¼ W | 12 W |
40 S | 10 E |12¾ W | 14½ W |
40 S | 15 E |15½ W | 17¼ W |
40 S | 20 E |18½ W | 20 W |
40 S | 25 E |21¼ W | 22¾ W |
40 S | 30 E |23½ W | 25¼ W |
40 S | 35 E |25½ W | 27 W |
40 S | 40 E |27 W | 28½ W |
40 S | 45 E |28¼ W | 27¼ W |
40 S | 50 E |28¼ W | 26 W |
40 S | 55 E |26½ W | 24½ W |
40 S | 60 E |24¼ W | 22¾ W |
40 S | 65 E |22 W | 20¾ W |
40 S | 70 E |19½ W | 19½ W |
40 S | 75 E |17¼ W | 18¼ W |
40 S | 80 E |15½ W | 17¼ W |
VARIATION _of the_ Magnetic-Needle, _from the Islands of_ Orkney _to_
Hudson’s Straits, _for the Year 1757_.
----------+------------+---------------------------------------
West | |
Longitude | | Degrees of North Latitude.
From | |
_London_. | | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63
----------+------------+----+----+----+----+----+----+----+----
Degrees. | | | | | | | | |
4 | | | | | 18 | 18 | 19 | 19 |
10 | Degrees | | | 19 | 19 | 20 | 20 | 21 |
27 | of | | | 24 | 24 | 25 | 25 | |
45 | West | 29 | 29 | 30 | 31 | | | |
55 | Variation. | | | | | | | |
65 | | | | | | 39 | 40 | 41 |
----------+------------+----+----+----+----+----+----+----+
VARIATION _in_ Hudson’s-Bay _and_ Straits, _for the Year 1757_.
----------+------------+--------------------------------------------
West | |
Longitude | | Degrees of North Latitude.
From | |
_London_. | |52|55|56|57|58|59|60 | 61 | 62 | 63
----------+------------+--+--+--+--+--+--+---+----+----+----
Degrees. | | | | | | | | | | |
65 | | | | | | | | 39| 40 | 41 |
71 | Degrees | | | | | | | | 41 | 41 |
79 | of | | | | | | | | | | 43
81 | West | | | | | | | | 38 | 39 | 40
83 | Variation. |18|20| | | | | | | 39 | 40
86 | | | | | | | | | 35 | 37 |
92 | | | | |17|17| | | | |
94 | | | | | |17|18| | | |
95 | | | | | | |18| | | |
----------+------------+--+--+--+--+--+---+---+----+----+
We have been informed, that in Hudson’s-Bay, there has been very little
alteration in the variation of the compass during the twenty years last
past.
XLII. _An Account of some extraordinary Tumors upon the Head of a
labouring Man, now in_ St. Bartholomew’s _Hospital. By_ James Parsons,
_M.D. F.R.S._
[Read Nov. 10, 1757.]
THIS poor man, whose name is John Tomlinson, gives this account of
himself: That he was born at or near Rotherham in Yorkshire, and is now
about 25 years of age: that when he was a boy of four or five years
old, at play with other children, he received a blow from one of them
upon the top of his head; and believes that hurt, he then received,
was the beginning of the appearances, that are represented before you.
_See_ TAB. XIV. The tumor upon the top of his head, however, grew
first, and, after having spread all over the vertex, extended gradually
downwards over his right shoulder, and forwards over the _os frontis_,
on the same side, till it stretched downwards into a lax flabby
substance all over the right side of his face and shoulder: then the
upper of the three anterior tumors arose from the large one; the middle
one from the _ala nasi_, pulling it down by its weight, as you see it
in Figure 1.[198]; and the lower one was pendulous from the inside
of the great tumor by a narrow neck. These are the appearances which
present themselves at first sight; but those under the great tumor
are no less extraordinary; for, upon lifting up the great tumor, and
looking up under it, his right eye comes in sight, with which he sees
very well, and the eye is clear and sound; but the under lid is pulled
down, and stretched to six or seven inches long, to which a tumor hung
also, as large as that anterior one at the chin, the lowest of the
three; besides several flaps and _rugæ_ of skin, and smaller tumors.
[Illustration: _Philos. Trans. Vol. L._ TAB. XIV. _p. 350_.