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47
nemes Udførelse dels directe, medens de toges, dels ved at
gjennemse Observationsblanketterne, som jeg opbevarede.
Samtlige Reductioner af Observationerne for 1877 og
1878, og de følgende Beregninger af Formlerne for de
daglige Perioder ere udførte af Herr A. Steen, Første Assistent
ved det meteorologiske Institut.
Den paaværende Plads for hver Time har jeg bestemt
paa følgende Maade. Først afsattes paa et stort Kart (i
Maalestokken 1:300000; l’ = G.ram6) de af Capt. Wille
bestemte Positioner for samtlige Loddestationer. Imellem
disse blev Skibets Vej afsat efter Skibsjournalen. Efter de
i denne indeholdte Opgaver over Tiden for Begyndelsen og
Enden af en Lodning, en Skrabning eller en magnetisk
Observation, samt over udsejlet Kurs og Distance for hver
Time afsattes paa Kartet paaværende Plads for hver Time
og de saaledes bestemte Bredder og Længder indførtes i de
meteorologiske Tabeller. Idet jeg forøvrigt, angaaende
Nøjagtigheden af de saaledes bestemte Bredder og Længder,
henviser til Capt. Willes Afhandling i denne
Generalberetning om Apparaterne og deres Brug,1 Capitlet om
Navigeringen, skal jeg her kun anføre, at den sandsynlige Fejl
af en paaværende Plads er beregnet til at være mellem 1
og 2 Bueminutter (Kvartmil k 1/6o Æquatorgrad), nærmest
til lidt over 1 Minut.
De følgende Tabeller indeholde de meteorologiske
Observationer, der gjordes paa Nordhavs-Expeditionen i
Søen og i enkelte Havne.
direct, when being taken, or by going through the schedules
the mates had filled out, and which I took care to preserve.
The reduction of all the observations taken in 1877
and 1878, together with the subsequent computation of the
formulae for the diurnal periods, were made by Mr. A.
Steen, First Assistant at the Meteorological Institute.
The Position of the Vessel for every Hour I
determined as follows: — On a large map, scale -3trfrajütj > l’ —
0.mm6, were first set off the positions of all the
sounding-stations, determined by Captain Wille. Between these
stations the course of the vessel was laid down according to
the ship’s logbook. From the entries in the logbook, giving
the time for the commencement and termination of a
sounding, a dredging operation, or a magnetical observation,
as also course and distance run for every hour, the
position of the vessel for every hour was set off on the map,
and the latitudes and longitudes thus determined entered
in the Meteorological Tables. For the rest, as regards the
accuracy of the said latitudes and longitudes, I will refer
to Capt. Wille’s Memoir, published in this General Report,
on the Apparatus, and how used,1 Chapter on Navigation,
and merely observe here, that the probable error of a
position is computed to range between 1 and 2 minutes of arc
(nautical mile = 1/60 of an equatorial degree), and generally
to be a little over one minute.
The following Tables contain the meteorological
observations taken on the North-Atlantic Expedition at sea
and in certain harbours.
Rubrik 1. h. Klokkeslet, regnet fra Midnat til Midnat.
Klokkeslettet er noteret efter Skibsuret,
der hver Middag stilledes til at vise sand
Tid ombord.
„ 2. (f. Observationsstedets nordlige Bredde.
„ 3. X. Observationsstedets Længde, regnet fra
Greenwich Meridian, Østlig (E) eller
Vestlig (W). I Havne er angivet disses Navn.
„ 4. a. Vindens Retning retvisende, paa nærmeste
Compasstreg.
„ 5. W. Vindens Hastighed, i Meter pr. Secund.
„ 6. b. Barometerhøjden, i Millimeter, reduceret til
0.° C., Normalbarometret (corrigeret) i
Christiania og Havets Overflade, men ikke til
Højden ved 45° Bredde.
„ 7. t. Luftens Temperatur i Celsiusgrader.
„ 8. e. Vanddampenes Tryk efter Psychrometret,
beregnet efter Jelineks Tabeller.
,, 9. r. Relativ Fugtighed efter Psychrometret,
beregnet efter Jelineks Tabeller. 00 = 100 °/0.
Column 1. h. Hour, from midnight to midnight. The
hour was taken from the ship’s clock, which
every day at noon was set to apparent time
on board.
,, 2. q<. North latitude of place of observation.
„ 3. A. Longitude of place of observation from the
meridian of Greenwich, East (E) or "West
(W). When in harbour, the name of such
is given.
„ 4. a. Direction of Wind, true, to the nearest
point of the compass.
„ 5. . W. Velocity of Wind, in metres per second.
„ 6. b. Height of Barometer, in millimetres, reduced
to 0° C., the standard barometer (corrected)
in Christiania and the sea-level, but not
to the height in latitude 45°.
„ 7. t. Temperature of the Air in degrees
centigrade.
„ 8. e. Force of Aqueous Vapour as found from
the psychrometer, computed according to
Jelinek’s Tables.
„ 9. r. Relative Humidity as found from the
psychrometer, .computed according to Jelinek’s
Tables ; 00 = 100 per cent.
C. Wille. Apparaterne og deres Brug. Side 53.
C. Wille. The Apparatus aud how Used, p. 53.
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