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17
erodes en Kurve. Denne nærmer sig asymptotisk til at
blive en ret Line parallel med Abscisseaxen. Det Punkt,
fra hvilket af denne Parallelisme begyndte, afmerkedes og
ligeledes det tilsvarende Tidspunkt efter Uret, ved hvilket
altsaa den fuldkomne Accommodation kunde ansees for at
være naaet. Fra Accomodationspunktet afsattes tilbage
hele Grader, og de tilsvarende Tidspunkter efter Uret
afmerkedes. Der toges Forskjellen mellem Tidspunktet
folden indtraadte Accomodation og disse Tidspunkter. Disse
Tal udviste da, hvor lang Tid Dybvandsthermometret
behovede for at accommodere sig, naar dets Temperatur var
1°, 2°, 3°. o. s. v. forskjellig fra det omgivende Vands
Temperatur. Jeg fik saaledes følgende Tabeller, i hvilke
/\ T betegner Temperaturforskjellen og Z\ t Tidsforskjellen
i Minuter og Tiendedele deraf.
of time and seconds; and with ordinates: computed
difference between readings of thermometers, I
constructed a curve. This tends asymptotically towards a
right line parallel to the axis of the abscissæ. The
point from which this parallelism commences, was marked
off, as also the corresponding point of time, by which
therefore perfect accommodation may be assumed to have
been attained. From the point of accommodation were
set off, backwards, whole degrees, and the corresponding
points of time marked off. The difference was taken
between the point of time for the accomodation fully set
in and the said points of time These figures indicated
how long a time the deep-sea thermometer required to
accomodate with its temperature different 1°, 2°, 3°, &c.,
from that of the surrounding water. I was consequently
able to work out the following Tables, in which T
denotes the difference in temperature and A t the
difference in time, computed in minutes and tenths of minutes.
Negretti & Zambra 89. Kviksølvpiezometer. ( Mercury-Piezometer. t Casella-Buchanaii 49.
At At AT At At At
Efter disse Undersøgelser lod jeg Indexthermometrene
ikke hale ind, førend de havde været 10 Minuter i
Vandet, og Vendethermometrene 3 Minuter. Under
Tliermo-metrenes Bevægelse med Loddet ned igjennem Vandet vil
Strømningen bevirke en meget raskere Accomodation end
Tilfældet var under Forsøgene, i hvilke Thermometret
stode stille i Vandet. Den Tid, som blev givet
Dybvands-thermometrene til at accommodere sig, var saaledes altid
fuldkommen betryggende.
Jeg gaar nu over til at redegjøre for de enkelte
Dyb-vandsthermometres Correctioner.
m. ni. ni.
i° 2.5 i" 7-7 5-4
2 2.7 2 9.0 2 6.3
3 2.8 3 9-7 3 M
4 2.85 4 101 4 7-5
5 2.87 5 10.3 5 7.9
,, ,. 6 10.5 6 8.2
,. ,. 7 10.6 7 8.5
,, 8 10.7 8 8.7
,. 9 10.8 9 9.0
,. ,, 10 10.8 10 9.2
,. ,, li 10.9
, 12 10.95
•3 "-o
14 3.0 14 11.o
After these investigations, the index-thermometers were
not hauled in till they had been 10 minutes in the water,
nor the inverting-thermometers till they had been 3. On
the downward-passage of the thermometer with the lead
through the: water, the current will occasion a much more
rapid accomodation than was the case with the experiments
during which the thermometers remained stationary in the
water. Hence, the time given the deep-sea thermometers
to accomodate was always amply sufficient.
I shall now pass on and explain the corrections for the
several deep-sea thermometers.
Miller-Casella No. I.
Nulp 1111 kt-Correetion.
1877. Juli 10. o.°i7 Tromsø.
1878. Maj 8. -f- 0.07 Christiania.
,. Juli 23. -f- 0.13 ved peeren Eiland.
„ Nov. 29. -f- o .05 Christiania.
Middel o°.io5
Miller-Casella No. I.
Zero-Correction.
1877. July 10. + o°. 17 Tromsø.
1878. May 8. -f 0.07 Christiania.
„ July 23. -j- 0.13 off Boeren Eiland.
„ Nov. 29. 0.05 Christiania.
Mean -j- o°. 105
Den norske Nordhavsexpeilition. II. Mohn: Nordhavets Dybder, Temperatur og S trimminger.
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