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36
i Numerfølge, I. II, III. og indsigtedes ved Øjemaal i
Linien. Det blæste en liden Bris tvers paa Linien og
Operationen gik let ved at commandere "luf" og "fald"’. Naar
Stængerne flyttedes, satte jeg Foden paa den sidste Stang,
indtil den næste var sat til dens Ende og orienteret.
Maa-lingen kunde saaledes paa det flade Terræn blive ret
nøjagtig. Grundliniens bele Længde fandtes ved Hjelp af
Stængerne og et Metermaal at være 299.11 Meter. Nogen
merkelig Reduction for Stængernes Heldning liar jeg ikke
fundet det praktisk nødvendigt at anbringe. Metermaalet.
der anvendtes som Normalmaal, er et i Paris kjøbt, med
Regjerings-Steinpel forsynet Træmaal til at lægge sammen.
Det er henimod en Millimeter længere end et Par andre
herværende Meterscalaer af omhyggeligere Construction.
Dette Overskud kan regnes at gaa op imod den ved
Maale-stængerues Heldning og unøjagtige Orientering fremkomne
Fejl. Efter Afslutningen af Grundliniemaalingen opsatte
jeg Signalerne Y. T og videre vestover.
Den 21de August beregnedes Gaarsdagens
Observationer og afsattes i Kartet. Capt. Grieg foretog Lodninger
i Advent Bay. Om Eftermiddagen maalte jeg Yinkier fra
de Signaler, jeg havde opsat den forrige Eftermiddag.
Den 22de fortsatte Capt. Wille Kartarbejder Capt.
Grieg loddede om Formiddagen, og Capt. Wille om
Eftermiddagen. Kl. G Eft. lettede vi og sejlede ud Isfjorden.
Kartet over Advent Bay er tegnet af Capt. Wille.
Det originale Kart i 1 :30000 er gjengivet hér i 1:50000.
Kartet beror, som af ovenstaaende Beskrivelse vil sees, paa
en fuldstændig Triangulation. De trigonometriske Punkter
ere paa Kartet merkede med de latinske Bogstaver.
Azimutbestemmelsen. der orienterer Kartet, antages sikker paa
et Minut, og Længdeudstrækningerne sikre paa en
totusindedel af samine. Angaaende den absolute Bredde og
Længde henvises til min Afhandling om de astronomiske
Observationer Side 19.
Forresten indeholder Kartet selv de nødvendige
Oplysninger.
boatswain and a sailor, so as to extend one after the other
(I, II, III) from Base B. and as nearly as the eye
could determine in the true line. There was a light breeze
blowing at right angles to the base line, and the
operation could be easily performed by commanding "luff" and
"off." When the rods were being moved, I put my foot
on the last of them, keeping it there till the next had
been placed end on against it, and properly adjusted. In
this manner a pretty accurate measurement could be made
on the flat ground. By means of the rods and a
metre-measure, the whole length of the base line was found to be
299.11 metres. Any appreciable reduction for the
inclination of the rods, I have not thought necessary to apply.
The metre-measure, which I used as the standard measure of
length, had been bought in Paris; it is of wood, furnished with
the government stamp, and made to fold up. This instrument
is about a millimetre longer than two other metre-scales,
of more accurate construction, that we have here. The
excess in length may be regarded as compensating the error
arising from the inclination and imperfect adjustment of the
rods. After measuring the base line, I erected the signals
Y, T. and others farther west.
On the 21st of August, the observations taken the
day before were computed and laid clown on the Map.
Capt. Grieg sounded in the Bay. In the afternoon I
measured angles from the signals I had erected on the
previous day.
On the 22nd. Capt. Wille went on constructing his
map. Capt. Grieg took soundings in the forenoon and
Capt. Wille in the afternoon. At 6 p. m. we got under
weigh, and steamed out of lee Sound.
For the Map of Advent Bay we are indebted to
Capt. Wille. The original map was on a scale of -^jrou ’
the scale of that annexed to this Memoir is sh^-htj- As
will appear from the above description, the Map of Advent
Bay is based on a complete triangulation. The
trigonometrical points are denoted by capital letters. The azimuth
determination, on which is based the direction of the
meridian of the Map, may be regarded as true to a minute,
and the longitudinal extent as correct within the
two-thousandth part of the actual length. As regards the
absolute latitude and longitude, the reader is referred to my
"Astronomical Observations," page 19.
For the rest, all necessary information is given in
the Map.
Billederne, Fig. 1—9, ere tegnede af Landskabsmaler Carl
Xirlnm, efter Skitser tagne paa Stedet af Hr. F. W. Schiertz. Prof.
G. O. Sars og Prof. H. Mohn.
Figs. 1 to 9 are drawn by Carl Nielsen, artist, from sketches
taken on the spot by F. W. Schiertz, artist to the Expedition, Prof.
G. O. Sars, and Prof. H. Mohn.
Translated into English by John Hazeland.
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