■ ' II!
Il
||(
IK
o c e a n . down, and fhutting,while it was ,hawling up again.. T h e annexed
table will at once fhew the refult. o f the experiments..
Date. ' . Latitude.
Degrees o£ Fahrenheit’s. .
Thermometer. Depth in
fathoms.
Stay of the
Thermometer
in the deep.
'
, Time. inttf
haulingthe
ThermoIn
the air. On the furlace meter upf
of the fea-wat.
At a certain
depth in the fea.
September 5. oo° $zr N. -7f>§° 74“ ’
<3s O
- 8$F. * 3c/ 1 r f i '
27- 24» 44! S. ' 72f° ?°°. - 68-, 80 F. p H 1 i
0£lober 12. 34° 4®' S- j 6 o° I - 59? - j8" ^ 100 F. - 2Cr- ■ (/
December 15. 550 oc/ S. 3° i° 3°° 346 100 F. 1 p s i:
23.
CO
‘
33° 32° 34i 0 ; 10© F. i6f H r
1773.
January 13. 64° o<J S. 37° 33l° 3 2° 100 F. 20' /
From this tabfe it appears, that under-the Line, and near the
Tropics, the water is cooler at a great depth than at its furface-
In high latitudes, the air is, colder-fometimes, fometimes very near
upon a par, and fometimes warmer than the fea-water at the depths
o f about 100 fathoms j according as the preceding changes o f the
temperature o f the air, or the direction and violence o f the' wind.
6 haphappen
to fall out. For it is to. be obferved, that thefe experiments
were always made when we had a calm,, or at leaf! very little
wind; becaufe, in a gale o f wind, w e could not have, been able,
to make them in a boat. Another probable caufe o f the difference,
in the temperature o f the fea-water, in the fame high latitude,,
undoubtedly mull be fought in the ic e ; in a fea covered with high
and extenfive, ice. iflands, the water fhould be colder than, in a fea.
which is at a great dillance from any ice-
.T h e P h o s p h o s e a -l L i g h t o f th e S e a - W a t e r ,.
I t is very well known, that- the fea-water has fometimes-a Lu minous
appearance, or, to ufe a more philofophical word, a phaf-
fh o r ica l lig h t. Many have endeavoured, to give us the real caufes.
o f this phænomenon * ; and, in confèquence, fome have brought,
us. the drawing o f a curious fubmarine infeft, related, to. the fhrimp .
kind, which had a peculiar luminous appearance, and affected this,
to be the caufe o f the phofphoreal light o f the fea -f-.. Others again-,
afhribe it . to the great number, o f animals, o f the. mollufca-tribe,
fwimming:
* The Father Bourzes, in The Lettres Edifiantes, tom. ix. Par. iyjOj fpeaka-of the-phof*
phoreal light of the fea with judgment ; and .ftill more fo, the late ingenious philofopher,
Mr. Ganton, Phil. Tranf. _vol. ix. p. 446, in his paper oh the luminous appearance of the-
fes..
t See the Gentleman’s Magazine, for. 17715 and Baûeri ©pufc.fubfec.. Tom. j . . P.\i. .
p. 31. Tab.Jv.jfgv
OCEAN«-