Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
11
undersøge det mellem Norge. Færøerne. Island. Jan Mayen
og Spitsbergen beliggende Hav. vare heller ikke de paa
den engelske Challengerexpedition udførte Observationer
offentliggjorte, saaat de Data. der den Gang forelaa, i
Righoldighed paa ingen Maade kunde sammenlignes med dem.
som nu staa til Raadighed. Især var det med Hensyn paa
den geografiske Udbredning, at Observationerne ikke kunde
give synderig omfattende Oplysninger, idet det eneste Hav.
som endnu var grundigt undersøgt, nemlig Nordsoen, baade
med Hensyn paa Dybde og øvrige physikalske Forholde afveg
i høi Grad fra det store Verdenshav, forsaavidt man kjendte
det. Da der først var fattet Beslutning, om at der ogsaa paa
den norske Xordhavsexpedition skulde udfores chemiske
Undersøgelser af samme Art som paa de tidligere
Expeditioner. maatte det derfor .for Hr. S. Svendsen, hvem disse
Arbeider oprindelig vare overdragne, fremstille sig som en
meget vigtig, ja man kan sige, som den vigtigste Opgave
at tilveiebringe de fornødne Oplysninger om Gasarterne i
Søvandet, hvad angaar den Del af Verdenshavet, som Norge
havde paataget sig at gjøre til Gjenstand for videnskabelig
Undersøgelse. Med Hensyn paa cle Midler, der skulde
benyttes til Løsningen af denne Opgave, da kunde Valget af
disse ikke falde vanskeligt, da de af Dr. Jacobsen
benyttede Methoder og Apparater strax maatte udpege sig som
de hensigtsmæssigste fremfor Alt. hvad der for Resten stod
til Raadighed, selv 0111 ikke Hensynet til Resultaternes
Sammenlignelighed havde gjort deres Anvendelse ønskelig.
Svendsen besluttede derfor uden Modificationer at optage
de paa Poiueraniaexpeclitionen benyttede Arbeidsmethoder.
og var det i Henseende til Expeditionens Udrustring et
stort Held. at Professor Dr. Jacobsen velvilligen tilbod sig
at anskaffe cle til de chemiske Undersøgelser fornødne
Apparater.
Det var dog ikke alle de ved Pomeraniaexpeditionen
benyttede Apparater, som ogsaa kom til Anvendelse paa
den norske Nordhavsexpedition, idet man der besluttede at
anvende en af Capitain Wille construeret Vandhenter. som
især i en Henseende maatte være at foretrække for den
af Dr. H. A. Meyer angivne. Paa denne maatte nemlig,
naar den skulde optage Vandprøver fra intermediære Dyb.
Cylinderen udløses ved et langs Linen nedsænket Lod.
som aldeles udelukkede Muligheden af paa Linen, samtidig
at have anbragt Thermometre eller deslige, saaledes som
det uden mindste Ulempe kan forenes meel Brugen af Willes
Vanclhenter.
Willes Vandhenter, som findes afbildet i Fig. 2. er af
Opfinderen bleven beskrevet paa følgende Maade:
"Vandprøven indesluttes i dette Instrument i et for
Pladsens Skyld spiralformig l}øiet Rør. der under
Nedfiringen i Vandet holdes aabent i begge Ender, saaledes at
Vandet frit kan strømme igjennem ; men naar Instrumentet
ophales et kort Stykke, lukkes Enderne af Røret meel to
Ventiler, hvorved elet da i Røret staaende Vancl afstænges
og kan bringes op.
the sea lying between Norway, the Feröe Islands. Iceland.
Jan Mayen, and Spitzbergen, the results of the
observations instituted 011 the ; Challenger’ Expedition had not yet
been made public; and hence the data then obtained
were few compared to those of which we * are now in
possession. It was more particularly with respect to
geographical distribution, that the information former
observations could supply had proved but meagre, inasmuch
as the only sea thoroughly investigated, viz the
German Ocean, was found to differ widely in regard to depth
and other physical conditions from the Atlantic and Pacific,
so far at least as our knowledge of both may be said
to extend. The resolution once formed, of instituting on
the Norwegian North-Atlantic Expedition a series of
chemical experiments similar to those performed 011 former
Expeditions. Mr. S. "Svendsen, the gentleman on whom the
execution of this task was to have devolved, could not
but regard as an important, nay the most important, part
of his labours, accurate determinations of the gases
present in that tract of the Atlantic Ocean which the
Norwegian Expedition was to make the subject of scientific
investigation. Respecting the means whereby to solve this
problem. 110 difficulty could be experienced in making a
choice, since Dr. Jacobsens methods and apparatus must
at once suggest themselves as by far the best, even apart
from the consideration, that, for the better comparing
of his results with those obtained, their adoption was
desirable,. ’ Svendsen, therefore, decided in favour of the
process — without modification — resorted to on the
"Pom-era nia’ Expedition; and it was a fortunate concurrence,
that Professor Jacobsen should kindly volunteer his
assistance in procuring the various apparatus necessary for the
chemical experiments.
All the apparatus made use of on the vPomerauia’
Expedition, were not. however, adopted on the Norwegian
North-Atlantic Expedition: the instrument, for instance,
employed to collect water, which, particularly in one respect,
must be held preferable to that described by Dr. H. A.
Meyer, had been constructed by Captain C. Wille R. N.
When drawing water from intermediate depths, the
cylinder in the latter is detached by running a weight clown
the line, which precludes the possibilty of having a
thermometer. or any other instrument, attached to it, an
advantage which may. without the slightest drawback, be
combined with Wille’s apparatus.
Wille’s instrument for collecting water, of which Fig. 2
is a represention, has been described by the inventor as
follows: —
"The samples of water drawn with this instrument are,
to save space, brought up in a spiral tube, which, when
sunk through the water, is kept open at both ends, to admit
of the free passage of the fluid; but, on the instrument,
at the required depth, being hauled in a few fathoms, the
ends of the tube are closed by means of two valves, and
the water it contains, thus prevented from escaping, may
be brought to the surface.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
