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39
kolte Therniomctrcs Angivelser og dotte Sliddel, faar man
den følgende Tabel, der viser Gjennenisnits-AfvigeLsen for
hvert enkelt Thermometer:
Eiter denne Sammenstilling bliver saaledes
Middel-fejlen af en enkelt Temperaturbostemmolse i Dybet under
o".o5 i 1878. Da saavel i 187(5 som i 1877 den samme
Omhu er anvendt paa Aflæsningen af Tliorniometrene. idet
denne altid foretoges af 2 Iagttagere, der confererede sine
Noteringer, tør i Gjenneinsnit vore Dybteiuperaturer
være sikkre paa en Tiendedel Grad Celsius. En lignende
Beregning som for 187S giver for 1877 Middelafvigelse fra
Medium af 3 Observationer med i) forskjellige Thormometre
+ o°.o34 og for 1876 fra Medium af 2 Observationer
± o".o33.
Ovenfor (Side 11) er paavist, at Buchanans
Kviksølv-piezonietor registrerer Temperaturen i Dybet rigtig, selv
om denne skulde stige lidt med Dybden. De øvrige
Index-thormometre derimod registrere rigtigt mod Miiiimumsindexen
kun under den Betingelse, at Temperaturen aftager med
Dybden i et sterkere Forhold end Trykkets Virkning til
at skyde Indexen nedover voxer mod Dybden. At dette
er Tilfældet i de større Dybder godtgjøres af følgende
Tabel, i hvilken jeg har sammenstillet alle de Observationer,
dor kunne tjene til en nærmere Bestemmelse af
Temperaturens Variation mod Dybden i de dybere Lag.
and compute the deviation between the indications of the
several thernio.meters and that mean, we got the following
Table, which shows the average deviations for each
thermometer :
According to this comparison, the mean error of a
single determination of temperature in the deep was less
than o’.05 in 1878. As equal care was invariably taken
both in 1876 and 1877 with the reading of the
thermometers, this having in every case been done by 2 observers,
who compared notes, our deep-sea temperatures may 011
an average be taken as correct within one-tenth of a degree
centigrade. A computation similar to that for 1878 gives
for 1877 the mean deviation from the mean ol 3
observations with 3 different thermometers + o0.o34, and for 187(5
from the mean of 2 observations +o°.o33.
It has been shown above (p. 11), that Buchanan’s
Mercury-Piezometer registers the temperature accurately in
the deep strata, even should it rise slowly with the depth.
The other index-thermometers, however, register correctly
with the minimum-index solely in the event of the
temperature diminishing with the depth in a proportion greater
than that in which the force of the pressure exerted in
pushing the index, increases with the depth. That such
is the case in the great depths will be seen from the
following Table, where I have set down all the
observations that can serve for more closely determining the
variation of temperature with depth in the deeper strata.
No. I. + 0".04i 31 Observationer.
a. 44 5
ni. 55 12
IV. IO 2
VI. 44 5
VII. 15 2
IX. .5
B. 43 ’7
41). 36 10
33 12
411. 32 12
«II. 42 5 b
’■’I. 0.037 4
Middel (Mian) + 0".040: 170 Olis.
Lodskuil Dybdo Dylxlo- Temp,- Icmp.-Yar. Trykoorr.
Aar. No. Favno. Therm. Tempe- Forskjcl. Forakji L pr. IOIKI Fv. pr. Hunt Fv. Dim
(J-rar.; (Swutliiu/. No. ratur. (flig. I Mf. C I nr. of ’l’’ mi’. (fr. a.on-rorr.
.V».) •’f itipth.) "/ ’< »(..) for WOO Mm».) for Willi Fmt.)
1876 40 I02Q V -1 ".03 186 — o».i7 — 0".Q I - O". 1 I — o".8o
■215 V - i .20
51 72 I III - 0.94 205 — 0 .16 –O .78 -O .07 — 0 .71
Q2Ö IV -1.10
51 926 IV — i .10 237 — 0 .04 — O ,l8 — O .1 I — 0 .07
’ 163 V — ’ "4
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