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ombord ikke i fjerneste Maade vil kunne gjøre Regning
paa at opnaa, hvorhos man ’tillige vil have den Fordel at
kunne benytte directe Saltbestemmelser som Controlmiddel.
Mod de paa Expeditionen udførte Luftbestemmelser
vil ikke kunne gjøres nogen væsentlig Indvending, med
mindre man skulde anke over, at de benyttede Vandprøver
ere optagne ved Hjælp af Apparater, der ikke vare
omgivne med slette Varmeledere, saaledes at de ved
Ankomsten til Overfladen vilde have havt Anledning til at
antage en i Forhold til sin Luftmængde noget for høi
Temperatur. Denne Feilkilde kan dog ikke antages at
have faaet nogen væsentlig Indflydelse i et Hav som det
her undersøgte, hvor kun et meget tyndt Lag nærmest
Overfladen besidder en Temperatur af over 5". især da
Vand, der kun er svagt overmættet med Luft. meget
langsomt giver Slip paa den overskydende Del.
Det ved Udkogningen benyttede, af Jacobsen beskrevne
Apparat er i alt Væsentligt fundet særdeles bekvemt, kun
vilde det maaske være hensigtsmæssigt at give
Luftopsam-lingsrøret en noget forandret Form. hvorved man lettelig
vilde undgaa den Vanskelighed, hvormed det nu er
forbundet at overfylde Luftmængden i Eiidiometret uden Tab.
board; moreover, there is the additional advantage of being
able to test the results by direct salt-determinations.
As regards the air-determinations performed 011 the
Expedition, their general accuracy can hardly be impugned.
True, the apparatus with which the samples of water were
collected not having been surrounded by a non-conducting
medium, they may possibly in their passage to the surface
• have assumed a temperature somewhat too high as
compared with the amount of air contained in them; but the
error arising from this source cannot have exerted any
material influence, since the tract of ocean investigated
has but a thin stratum of water in which the temperature
rises above 5°; besides, water slightly surcharged with air
is found to part very slowly with the surplus portion.
The boiling-apparatus devised by Jacobsen proved
very convenient; possibly, however, the tube for collecting
air might be given a somewhat different form, to obviate
the difficulty now experienced in transferring the air to
the eudiometer without loss.
Ovenstaaende Afhandlinger ere indsendte til
Redac-tionscomiteen for den norske Nordhavsexpeditions
Generalberetning, No. 1 og II i April 1879 og No. III i
December samme Aar.
De i disse 3 Afhandlinger beskrevne Observationer
ere, forsaavidt de ikke ere udførte ombord, anstillede i
Professor Waages Afdeling af Universitetets chemiske
Laboratorium i Christiania.
Sluttelig benytter, jeg .Anledningen til at udtale min
Tak til D’Hrr Professorerne Waage og Mohn for den
Bistand. de under mit Arbeide med disse Gjenstande paa
flere Puncter har ydet mig.
These Memoirs were sent in to the Editorial
Committee for the Norwegian North-Atlantic Expedition as
follows: — Nos. I and II in April 1879 and No. Ill in
December.
The observations set forth in the foregoing Memoirs
were, when not taken on board, instituted in Professor
Waage’s department of the Chemical Laboratory of the
University of Christiania.
In conclusion. I must not omit to thank Professors
Waage and Mohn for the assistance they kindly rendered
me, in certain respects, when engaged on the investigation
of the subjects treated of in these papers.
Errata.
Page 3, line 20, from top of page, for ’3.">.4’to 32.4 — 33.6 per cent, being’ read l3.").4 to 32.4, 33.6 per cent being.’
— !), line 20, from top of page, for ’the extent to which the results based 011 that hyppothesis,’ etc. read ’the slight
extent to which Jacobsen’s results.’ etc.
’— 28, line 22, from top • of page, for ’soda was added, and the whole compound’ read ’carbonate of soda was
added, and the whole mixture.’
— 38, line 3,’ from foot of page, for ’soda’ read ’carbonate of soda."
— 39,’line 13, from foot of page, for ’soda’ read ’carbonate of soda.’
Translated into English by John Hazeland.
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