Full resolution (JPEG) - On this page / på denna sida - Pages ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
576 PHIPPs’s JOURNALs
O./ervations made by Dr. Irving of the Heat of the Sea agitated by a Gale of Wind, and that
of the Atmofphere.
SrpremBER the twelfth, the thermometer plunged into a wave of the fea, rofe to 62°
the heat of the atmofphere 50°.
This experiment was frequently repeated during the gale, and it gave nearly the fame
difference. At night, when the weather became moderate, the heat of water thirty fa-
thoms below the furface was 55°; the furface and the atmofphere were 54°
September the twenty-fecond, the fea-water was 60°; the atmofphere 59°: the wind
at S. W., a frefh gale.
Obfervations for determining the Height of a Mountain in Latitude 79° 44! ; by the Baro
4 meter, and Geometrical Meafurement,
Obfervations taken by the Barometer by Dr. Irving.
Avcust the eighteenth, the day remarkably clear.
Inches. -
At fix in the morning, the barometer by the fea-fide ftood at - 30,040
‘The thermometer 50°.
On the fummit of the mountain, about an hour and three quarters
later than the firft obfervation below, - - - 28,266
Thermometer 42°.
At about an hour later at the fame place, - - - 28,258
Thermometer 42°.
By the fea-fide, where the firlt obfervation was made, and about
three hours later, - gots de % “ - 30,032
Thermometer 44°.
Height of the mountain calculated by M. De Luc from the
firft obfervation - - - 1585 feet
From the fecond obfervation - . 1592
Mean - - « - I 588 I
Means ufed to afcertain the Height of the Mountain Geometrically.
A point was fixed upon, in the moft convenient place the ground would aduiit of
between the fummit of the mountain (a well-defined object) and the fea-fide; from
hence, in a right line from the mountain, a ftaff was placed at the fea-fide, by a theodo-
lite made by Ramfden, with two telefcopes and double Vernier divifions. ‘The inftru-
ment was carefully adjufted ; firft, by levelling the ftand with a circular level, and after-
wards the whole inftrument by the crofs levels. From hence(A) at right angles to the
{tation at the fea-fide.(C) and the top of the mountain (E), a bafe was meafured each
way to (B) and (D) of eight lines of feventeen fathom each ; in all, five hundred and
forty-four yards. ‘The divifions of both the Verniers were carefully examined, both at
fetting off the ftation by the fea-fide, and thofe at the extremities of each bafe, the fixed
telefcope being kept directed to the fummit of the mountain, and the moveable one di-
rected at right angles each way, both divifions of the Vernier coinciding exactly. Sta-
tion ftaves were fixed perpendicular by the vertical hair of the telefcope. The altitude
5 of
<< prev. page << föreg. sida << >> nästa sida >> next page >>
