nernes 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 dag- 
lige Perioder ere udførte af Herr Å. 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; 1’ = 0.”"6) 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 mdførtes i de 
meteorologiske Tabeller. Idet jeg forøvrigt, angaaende Nøj- 
agtigheden af de saaledes bestemte Bredder og Længder, 
henviser til Capt. Willes Afhandling i denne Generalberet- 
ning om Apparaterne og deres Brug,! Capitlet om Navi- 
geringen, skal jeg her kun anføre, at den sandsynlige Fejl 
af en paaværende Plads er beregnet til at være mellem 1 
og 2 Bueminutter (Kvartmil å 1/4) 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. 
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. g. Observationsstedets nordlige Bredde. 
; 3. å. Observationsstedets Længde, regnet. fra 
Greenwich Meridian, Østlig (E) eller Vest- 
lig (W). I Havne er angivet disses Navn. 
» 4 a Vindens Retning retvisende, paa nærmeste 
Compasstreg. 
» 5. W. Vindens Hastighed, i Meter pr. Secund. 
» 6. bd. Barometerhøjden, i Millimeter, reduceret til 
0.0 C., Normalbarometret (corrigeret) i Chri- 
stiania og Havets Overflade, men ikke til 
Hojden ved 45° Bredde. 
» 7. tt. Luftens Temperatur i Celsiusgrader. 
» 8. ee Vanddampenes Tryk efter Psychrometret, 
beregnet eiter Jelineks Tabeller. 
ps 9 mr. Relativ Fugtighed efter Psychrometret, be- 
regnet efter Jelineks Tabeller. 00 = 100 °/o. 
1 ©. Wille. Apparaterne og deres Brug. Side 53. 
47 
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 
formule 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 deter- 
mined as follows: — On a large map, scale 35597; 1’ = 
0.""6, were first set off the positions of all the sounding- 
stations, determined by Captain Wille. Between these sta- 
tions 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 posi- 
tion 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,! Chapter on Navigation, 
and merely observe here, that the probable error of a posi- 
tion is computed to range between 1 and 2 minutes of are 
(nautical mile = '/g) of an equatorial degree), and generally 
to be a little over one minute. 
The following Tables contain the meteorological ob- 
servations taken on the North-Atlantic Expedition at sea 
and in certain harbours. 
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. 
Column 1. h. 
w 
g. North latitude of place of observation. - 
Longitude of place of observation from the 
meridian of Greenwich, East (E) or West 
(W). When in harbour, the name of such 
IS given. 
Direction of Wind, true, to the nearest 
point of the compass. 
5. W. Velocity of Wind, in metres per second. 
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°. 
Temperature of the Air in degrees centi- 
erade. 
Force of Aqueous Vapour as found from 
the psychrometer, computed according to 
Jelinek’s Tables. 
Relative Humidity as found from the psy- 
chrometer, computed according to Jelinek’s 
Tables; 00 = 100 per cent. 
1 C. Wille. The Apparatus and how Used, p. 53. 
