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•11
volden, hen til Ægøen og udenom denne. Der. hvor
Lagunvolden stoder til Foden äf Ægøen, saa vi Snelag,
dækkede af sort Sand. Vi fik den følgende Dag, som det
nedenfor vil sees. en simpel Forklaring paa dette Forhold.
Ægøens Sider ere overalt mod Søen ganske stejle. Paa
Sydvestsiden saaes i den tverbratte Væg et udmerket
tydeligt Profil af de Aske- eller Tuf-Lag. hvoraf Øen. eller nu
rettere Halvøen, er dannet. Ved svage Vindstød ramlede
Dele af Asken løs og styrtede som Ras ned i Fjæren eller
i Havet, eller hvirvledes af sterkere Vindstod op til høje
Røgskyer. Ægø-Kalven er et løsrevet eller tilbagestaaencle
Stykke af Ægøens Krater, bestaaende ligesom hele Øen af
sort Tuf, der indeslutter større og mindre Stene. I
Ægø-Kalven saaes Stene af indtil en Meters Tvermaal.
Ægøens Krater er nu aabent mod Sydost, den ydre Del er
begravet i Havet. Et Snit gjennem Ægøen fra NW—SE
viser paa den mod. Land vendende Side Lag af Aske. der,
parallele med Overfladen, helde mod NW. Henimod
Krateret derimod helde Lagene ned mod dette, mod SE. og
inde i Krateret ser man paa dettes bratte Vægge det
udgaaende af disse Lag som horizontale Belter.
Da vort Forsøg paa at komme i Land havde vist sig
frugtesløst, skred* vi til at bestemme Beliggenheden af vor
Ankerplads i Forhold til fremtrædende Punkter paa Land
ved trigonometriske Operationer. Ved Ægø-Kalven maalte
jeg .med Sextant Hojden af Stortoppen paa "Vøringen".
Da vi vare komne tilbage, til Fartøjet, rejste Capt. Wille
ud i Baaden, hvorfra han, liggende i en passende Afstand
og Retning, maalte Vinkelhøjden af Stormasten, og derpaa
Horizontalvinkelen mellem Stormasten og det Punkt, hvis
Beliggenhed skulde bestemmes, i. samme Øjeblik som jeg.
staaende ved Stormasten, paa givet Signal maalte
Horizontalvinkelen mellem Captein Wille og Punktet. Paa denne
Maade bestemtes Afstandene til Ægø-Kalven. til
Fugleberget paa Vestsiden, hvis markerede Top (se Fig.. 1) var
synlig over det lavere Ejde. og til^ Klippen -Lodsbaaden".
Fuglebergets Azimut bestemtes af Skibets Officierer ved 3
Compaspejlinger paa 3 forskjellige Kurser, og
Horizontal-vinklerne mellem dette Punkt og de øvrige observeredes.
Fra Fuglebergets Fod havde jeg den Dag, vi vare i Land,
maalt Stormastens Vinkelhøjdé og Skibets omtrentlige
Azimut. Saaledes vandtes et efter Omstændighederne godt
Grundlag for Øens Kartlægning. Samme Dag toges mange
Skitser. Sydlandets Udseende kunde nogenlunde opfattes;
dog vare de højeste Partier hverken nu eller senere under
vort Ophold fri for Skyer. Vort store Billede med
Lagunen viser Sydlandets Østside meget nær saaledes som det
saaes fra Ankerpladsen.
and some distance round. Where the barrier of the lagoon
abuts on Egg Island, we saw layers of snow covered.with
black sand. The next day, as will appear below, a simple
explanation was obtained of this phenomenon. The sides of Egg
Island are exceedingly precipitous towards the sea. On the
southwest side, the well-nigh perpendicular wall of the cliff exhibited
with remarkable distinctness the strata of ashes, or tuff, of
which the island, or now rather the peninsula, is composed.
A puff of wind brushing the surface sufficed to loosen and
blow about the ashes, some falling on the beach or into
the sea. while a violent gust would whirl them alolt in
clouds. The Egg Island calf (detached islet) is a disrupted
fragment of the Egg Island crater, consisting, as does the
whole of the main island, exclusively of black tuff, in which
are imbedded larger, and smaller stones. In the tuff of
the islet were seen stones measuring as much as 3 feet
across. The Egg Island crater is now open towards the
south-east, the outer portion lying buried in the sea. A
vertical section through the island, from NW. to SE.
exhibits on the land side layers of ashes, which, running
parallel to the surface, incline towards the north-west, but,
as they approach the crater, turn off towards it. dipping in a
south-easterly direction, and within, on the precipitous
walls of the cavity, make their appealance as broad
horizontal bands.
The attempt to land having proved abortive, we now
set about determining the relative position of our anchorage
and that of salient points on shore, by means of
trigonometrical observations. Off the Egg Island calf. I measured with
the sextant the height of the main mast of the "Vøringen."
On our return to the ship. Captain Wille put off in
a boat, from which, in the proper direction, he first
measured the angle of elevation of the main mast, and then
the horizontal angle between the main mast and the point
the position of which had to be determined, whilst I,
stationed beside the main mast, at a given signal,
simultaneously measured the horizontal angle between the boat and
the point. In this manner were determined the respective
distances of the Egg Island calf, of the Fugleberg, on the
west side, the conspicuous summit of the cliff (see Fig. 1)
being visible above the low-lying isthmus, and of the
"Lods-baaden." or pilot-boat rock. The azimuth of the Fugleberg
was taken by the officers of the vessel, from 3
compass-bearings on 3 different courses, and the horizontal angles
between that point and the other landmarks were observed.
From the foot of the Fugleberg» I had taken the day we
were on shore the angle of elevation of the main mast,
together with the approximate azimuth of the ship. We
thus, considering the circumstances, succeeded in obtaining
a fair collection of data for constructing a map of the
island. The same day numerous sketches were made of
the coastal scenery. The contours of the southern land
could be discerned with tolerable distinctness: but neither
on this nor any subsequent occasion during our stay were
its loftiest tracts visible. The large plate with the lagoon
shows the east side1 of the southern land very nearly as it
appeared from the anchorage.
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