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29
raturen io°.i, hvilket, med den ovenfor fundne Værdi
af «, der neppe kan antages at forandre sig med Tiden,
giver en Nulpunkt–Correction af -j- o’’.3i. For
Tidsrummet fra 17. Juli til 20. August ere Correction erne
aabenbart større end lør, i Medium -f- o°.54 for
Temperaturen io°.6, hvilket giver en Nulpunktcorrection af
+ o°.64. Jeg sætter derfor
for 21. Juni til 11. Juli C = + o".3i — 0.0088 t
og faar MF = + o°. u.
for 17. Juli til 20. August C == + o°.64 — 0.0088 t
og faar MF = + o°.o7.
Jeg har ogsaa beregnet Nulpunktcorrection af hver
enkelt af de i 1876 gjorte Sammenligninger med
Nor-malthermometret, sat disse Værdier op i Curve og
derefter udregnet Correctionerne for de enkelte Aflæsninger
paa No. VII fra Dybet. Se ovenfor under- Miller-Casella
No. V. Men der vandtes ingen gjennemgaaende større
Nøjagtighed, efter de af andre samtidig anvendte
Ther-mometres Angivelser. De med No. VII i den første Del
af Rejsen i 1876 maalte Temperaturer staa saaledes
tilbage for de øvrige i Nøjagtighed.
at the temperature 10". 1; and this, with the above
determined value of ff, which can hardly be supposed to
vary with the time, gives a zero-correction of -f o".3i.
For the period, July 17 to August 20, the corrections
are evidently greater than before, the mean being + o°.54
for the temperature io°.6, which gives a zero-correction
of o".64. Accordingly, I put
for June 21 to July 11 C = -J- o°.3i — o°.oo88 t,
and get MF = + o°. 11;
for July 17 to August 20 C = + o".64 — o".oo88 t,
and get MF + 0°.07.
I have also computed the zero-correction from each
comparison made in 1876 with the Standard-Thermometer,
drawn curves for these values, and then calculated the
corrections for the several readings of No. VII in the
deep sea (see above, Miller-Casella No. V). But no
invariably greater accuracy was attained, judging from the
indications of the other thermometers observed
simultaneously. The temperatures measured with No. VII 011 the
first part of the cruise in 1876 do not equal the others
in accuracy.
Tryk-Correction. Pressure-Correction.
Station. Dybde. (lXpth.) Therm. Therm. Ohs. Ber. (Comp.) i >itr.
No. Favne. (1-athotm.) vn. Sti Corr. Corr. O-B.
309 1065 — IMS —’ i°.3i — 0". r 6 — 0". 11 — o".o5
347 1429 — ’ .15 - i -25 — 0 .10 — O .15 + 0 .05
2494 ff = = — 0.0001 - 0".2Ö 04. MF — + o".o5
For 1000 Favne c = — o°.io.
„ 2000 „ — o .21.
Den samlede Correction for No. VII bliver saaledes:
for 1876 Juni 21 til Juli 11
-f- o".3i — 0.0088 t — 0.000104 h.
„ „ Juli 17 til Aug. 20
+ o".64 — 0.0088 t — 0.000104 h.
,, 1877 og 1878 + o°.i4 — 0.0088 t — 0.000104 h.
Miller-Casella No. IX.
Nulpunkt-Correction.
1878. Juli 23. — o". 17 Ved Beeren Eiland.
Nov. 29. — o
Middel
. 11 Christiania.
14
MF
+ o0.o3.
For 1000 fathoms c = — o’1.10.
„ 2000 „ — o .21.
The total correction for No. VII is accordingly,
for 1876 June 21 to July 11,
-f- o".3i — 0.0088 t — 0.000104 h.
„ „ July 17 to Aug. 20
+ o".64 — 0.0088 t — 0.000104 h.
„ 1877 & 1878 + o".i4 — 0.0088 t — 0.000104 h.
Miller-Casella No: IX.
Zero-Correction.
1878. July 23. — ou.i7 off Beeren Eiland.
„ Nov. 29. — 0.11 Christiania.
o°.i4 MF = + 00.03.
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