- Project Runeberg -  Den Norske Nordhavs-expedition 1876-1878 / The Norwegian North-Atlantic Expedition 1876-1878 / 2. Bind /
46

(1880-1901) [MARC]
Table of Contents / Innehåll | << Previous | Next >>
  Project Runeberg | Catalog | Recent Changes | Donate | Comments? |   

Full resolution (JPEG) - On this page / på denna sida - Sidor ...

scanned image

<< 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 been proofread at least once. (diff) (history)
Denna sida har korrekturlästs minst en gång. (skillnad) (historik)

7. Til at maale Nedbørens Mængde havde jeg opstillet
en Regnmaaler. Den stod paa Agterdækket, ved Roret,
(z Fig. 2) og hang i Slingrebøjler. Dens Overflade var 2
Meter over Dækket, 5 Meter over
Havfladen. Dens Construction sees
af Fig. 11. Aabningen var
cirkelformet, 225 Kvadratcentimeter
stor. Den var, efter den af Capt.
Hoffmeyer, Bestyrer af det danske
meteorologiske Institut, foreslaaede
Model, forsynet med Tud og Hank.
Maaleglasset var inddelt til at
aflæse Regnhøjden i Millimeter.

8. Søgangens Retning
observeredes efter Compasset og
cor-rigeredes for Deviation og
Misvisning.

9. Søgangens Styrke noteredes efter den sædvanlige
Scala: 0 ganske roligt Hav, til 9 = det mest oprørte Hav.
1 1876 forsøgte jeg nogle Gange at bestemme Bølgernes
Maxi-mamshøjde, ved fra Hyttedækket at iagttage det Øjeblik,
da Bølgetoppen viste sig i Flugt med Horizonten samtidig
med at Fartøjet var nederst i Bølgedalen, og maale Øjets
Højde over Vandet i dette Øjeblik.

10. Havvandets Temperatur i Overfladen
observeredes paa den Maade, at en Pøs Vand toges op i en Træpøs,
paa Bagbord Side mellem Fokkevant og Hytten (y Fig. 2).
Et Thermometer af Steger i Kiel, hvis Correction var
mindre end 0.°05 C., inddelt i 1/5 Grad, sattes ned i Pøsen,
og Temperaturen noteredes, saasnart det havde accomoderet
sig, idet Instrumentet stadig forblev med sin nedre Del i
Vandet. Accommoderingen varede */2 til 1 Minut.

Naar Expeditionen var i Søen eller ved ubeboede
Kyster, gjordes de meteorologiske Iagttagelser regelmæssig
hver Time, efter Skibsuret, der stilledes hver Middag efter
sand Tid ombord. I norske Havne, ved Thorshavn og
Reykjavik blev Observationernes Antal indskrænket til 3
eller 4 i Døgnet.

Observationerne udførtes af Styrmændene efter min
Instrux. I 1876 observerede saaledes DHrr. Harboe og
Wilkens, i 1877 DHrr. Wilkens, Carlsen og Christensen og
i 1878 DHrr. Krohn, Kaltenborn og Christensen.

I 1876 reducerede jeg stadig ombord det foregaaende
Døgns Observationer, og kunde saaledes controllere de gjorte
Observationer. De følgende Aar vovede jeg ikke at udføre
dette Arbejde ombord, da det havde vist sig at være altfor
anstrængende, men havde dagligt Tilsyn med Obsorvatio-

Fig. 11.
Fig. 11.


7. To measure the amount of the precipitation, I set
up a Rain-guage. It was mounted on the afterdeck, close to
the rudder (z Fig. 2), and hung in gimbals. The receiving
surface was 2 metres above the
deck and 5 metres above the
sea-level. The construction of this
instrument is shown in Fig. 11.
Its opening was circular, measuring
225 square centimetres. The guage,
provided with a spout and a handle,
was on the model proposed for
adoption by Captain Hoffmeyer,
Director of the Danish
Meteorological Institute. The
measuring-glass of the instrument was
graduated so as to admit of reading
off the height of fallen rain in
millimetres.

8. The Direction of the
Sea was observed by the compass,
and corrected for deviation and
variation.

9. The Disturbance of the Sea was noted according
to the usual scale, from 0 = a perfectly calm sea, to 9 = the
roughest sea. In 1876 I tried on several occasions to
determine the maximum height of the waves, by observing,
from the roof of the deckhouse, the moment when the crest
of a wave appeared on a level with the horizon, the vessel
being in the trough of the sea, and then measuring the
height of the eye above the water at the same moment.

10. The Surface-Temperature of the Sea was observed
as follows: — A bucket of water was drawn on the port side,
between the fore shrouds and the roundhouse (y Fig. 2).
A thermometer, by Steger of Kiel (graduated in fifths of
degrees), for which the correction was less than 0.°05 C.,
was immersed in the bucket, and the temperature noted so
soon as the thermometer had had time to accomodate itself,
the instrument remaining the whole time with its lower
part in the water. The time required for the thermometer
to take the temperature ranged from 2 to 1 minute.

"When the Expedition was at sea- or cruising off
uninhabited coasts, the meteorological observations were taken
regularly every hour by the ship’s clock, which was set
every day at noon to apparent solar time on board. In
Norwegian harbours, at Thorshavn, and at Reykjavik, the
number of observations was limited to 3 or 4 in
twenty-four hours.

The observations were made by the mates, in
accordance with instructions I had given them. In 1876, the
observers were Mr. Harboe and Mr. Wilkens; in 1877, Mr.
Wilkens, Mr. Carlsen, and Mr. Christensen; and in 1878,
Mr. Krohn, Mr. Kaltenborn, and Mr. Christensen.

In 1876, I reduced on board the observations taken the
day before, and could thus control the whole series. The
two following years I did not venture to perform this work
on board ship, which had proved of too laborious a character;
every day, however, I superintended the observations, either

<< prev. page << föreg. sida <<     >> nästa sida >> next page >>


Project Runeberg, Sun Dec 10 20:01:49 2023 (aronsson) (diff) (history) (download) << Previous Next >>
https://runeberg.org/nordhavexp/2/0058.html

Valid HTML 4.0! All our files are DRM-free