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I Polarstrømnien aftager Temperaturen langtsonist
med Dybet. Her skulde Vendethermometrene. der tjene
som Normaler for Bestemmelsen af Trykcorrectionerne,
være bedst accommoderede, det er forholdsvis mest
at’kjo-lede, vise forholdsvis lavere, og folgelig
Indexthernioinetrc-nes Trykcorrection vise sig større. Som man ser. er
Tryk-correctioiien i Polarstroiiinien fundet numerisk mindre end
i den varme Strom. Man tor altsaa, som ovenfor Side 15
bemerket, antage, at Vendetliermonietrene have
’acconuuo-deret sig fuldstændig efter Bundtemperaturen uagtet
Kassernes tabte Flydeevne.
Den Nnjagtighed. med hvilken de for Skalafejl og
Tryk reducerede Therniometeraflæsninger angive den
rigtige Temperatur i Dybet, kan man faa en Forestilling 0111
efter Storreisen af Middelfejlen for Trykcorreetiouens
Bestemmelse ved de forskjellige Indexthérmoinetre. da denne
Bestemmelse indeslutter Skalacorrectionens Fejl. For
Veiide-thermometrenes Vedkommende haves det samme Maal i
Middelfejlen af Sammenligningerne med
Normalthermonietret. Opstilles de nævnte Værdier af Middelfejlen ved en
enkelt Teni])eraturbestemnielse. faar man følgende Oversigt.
In the Polar current, the temperature diminishes
most slowly with the depth. Here the iiiverting-thernionieters
serving as standards to determine the pressure-corrections,
should prove best accomodated, i. e. comparatively most
cooled, viz. read relatively lower, and hence the
pressure-correction of the index-thermometers be greater. As will
be seen, the pressure-correction in the Polar current was
found numerically less than in the warm current. We may
therefore assume, as previously remarked, p. 15. that the
iiiverting-thernionieters had become thoroughly accomodated
in the bottom-temperature, notwithstanding the lost
buoyancy of the frame.
The accuracy with which the thermometer-readings
reduced for errors of scale and pressure, indicate the exact
temperature in the deep strata, can be found by the magnitude
of the mean error of the pressure-correction for the
different index-thermometers, since that correction contains
within it the error in the scale-correction. As regards the
iiiverting-thernionieters. we have the same standard in the
mean error ol’the comparisons with the Standard-Thermometer.
Now. if we put down the said values of the mean error
of a single determination of temperature, the result will be
as follows,
Thermometer. Mr.
Miller-Casella 1. + o°.o6i
II. o .072
,, III. 0.13Q
,. .. IV. 0.020
r V. o .072
VI. o .064
VII. o .050
IX. o .035
Buch. Kv. (Mere.) Piezom. o .067
Casclla-Bueh. 4t>. o .054
48. o .071
45). o .070
Negr. & Zanib. 80. o .026
„ „ 91. o .047
Middel (Mean)
Middel for Indexthermonietrene er + o0.oÖ4.
,. Vendethermometrene er + o .037.
Da den sidste Verdi indgaar i Bestemmelsen af den
förste bliver Middelfejlen for en Temperaturbestemmelse
med et Indexthermometer
+ v 0.0642 — o .037- = + O0.O52.
Ogsaa paa folgende Maade kan man bedømme
Teni-peraturbestem 111 eisernes Nøjagtighed. I 1878 sendtes ofte
3 Dybvandsthernioinetre. 2 Index- og et Vendetlicrinoineter
(i Regelen No. 89) med Loddet til Bunds. Tager man
Middel af disse 3 Thermometres for Skalafejl og Tryk
cor-rigerede Angivelser, og beregner Afvigelsen mellem de en-
+ o". 061
Mean for the index-thermometers + o".o64.
„ inverting-thermonieters + o .037.
The last of these values being contained in the
determination of the first, the mean error of a determination
of temperature with an index-thermometer will lie
.+ 1 0.064- — o .037-’ rr + 0".052.
Also in another manner can the accuracy of the
temperature-determinations be estimated. I11 1878, 3
deep-sea thermometers, 2 index and 1 invertiiig-therniometer (as
a rule No. 89), were sent to the bottom with the lead.
Now, if we take the mean of the indications of these 3
thermometers, corrected for errors of scale and pressure,
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