11 



volden, lien til Ægøen og iidenom denne. Der. hvor 

 Lagunvolden støder til Foden &i Ægøen, saa vi Snelag. 

 dækkede af sort Saml. \'i rik den følgende Dag, som det 

 nedenfor vil sees. en simpel Forklaring paa dette Forhold. 

 Ægøens Sider ere overalt mod Soen ganske stejle. Paa 

 Sydvestsiden saaes i den tverbratte Væg et udmerket tyde- 

 ligl Profil af de Aske- eller Tuf-Lag, hvoraf Øen, eller nu 

 rettere Halvoen. er dannet. Ved svage Vmdstød ramlede 

 Dele af Asken los og styrtede som Kas ned i Fjæren eller 

 i Havet, eller hvirvledes af sterkere Vindstod op til hoje 

 Røgskyer. Ægø-Kalven er et løsrevet eller tilbagestaaende 

 Stykke af Ægøens Krater, liestaaende ligesom hele Øen af 

 sort Tuf, der indeslutter større og mindre Stene. I Ægø- 

 Kalven saaes Stene af indtil en Meters Tvermaal. Æg- 

 øens Krater er nu aabent mod Sydost, den ydre Del er 

 begravet i Havet. Et Snit gjennem Ægøen fra X W — SE 

 viser paa den mod Land vendende Side Lag af Aske. der. 

 parallele med Overfiåden, helde mod NW. Heuimod Kra- 

 teret derimod helde Lagene ned mod dette, mod SE. og 

 inde i Krateret ser man paa dettes bratte Y;egge det ud- 

 saaende af disse Lac som horizontale Belter. 



Da vort Forsog paa at komme i Land havde vist sig 

 frugteslost. skred- vi til at bestemme Beliggenheden af vor 

 Ankerplads i Forhold til fremtredende Punkter paa Land 

 ved trigonometriske Operationer. Ved Ægø-Kalven maalte 

 jeg .med Sextant Højden af Stortoppen paa "Vøringen". 

 Da vi vare komne tilbage til Fartøjet. rejste Capt. Wille 

 ud i Baadeu. hvorfra han. liggende i en passende Afstand 

 x)g 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 Horizontal- 

 vinkelen mellem Captein Wille og Punktet. Paa denne 

 Maade bestemtes Afstandene til Ægø-Kalven. til Fugle- 

 berget 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 Vinkelhojdé og Skibets omtrentlige Azi- 

 mut. Saaledes vandtes et efter Omstændighederne godt 

 Grundlag for Øens Kartlægning. Samme Dag toges mange 

 Skitser. Svdlandets Udseende kunde nogenlunde opfattes; 

 dog vare de hojeste Partier hverken nu eller senere under 

 vort Ophold fri for Skyer. Vort store Billede med Lagu- 

 nen viser Svdlandets 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. Thenextday, as will åppear below, a simple ex- 

 planation wasobtainedof thisphenomenon, The sides of Egg Is- 

 land are exceedingly precipitous towards the sea. Onthesouth- 

 west side, the well-nigh perpendicular wall of the cliff exhibited 

 with remarkable distinctness the strata of asbes. or tuff, of 

 which the island, or now rather the peninsula, is composed. 

 A puff of wind brushing the surface sufriced to loosen and 

 blow about the ashes. some falling on the beach or into 

 the sea. while a violent gust would whirl them aloft in 

 clouds. The Egg Island calf (detacbed islet) is a disrupted 

 fragment of the Egg Island era ter. 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. ex- 

 hibits on the land side layers of ashes. which. running 

 parallel to the surface. incline towards the north-west. hut. 

 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 appearance as broad l.ori- 

 zontal bands. 



The attempt to land having proved abortive. we now 

 set about determining the relative position of our anchor - age 

 and that of salient points on shore. by means of trigonometri- 

 cal 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 bad to be determined, whilst I. sta- 

 tioned beside the main mast. at a given signal, simultane- 

 ously 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 tåken by the ofricers 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 tåken 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 stav were 

 its loftiest tracts visible. The large plate with the lagoon 

 shows the east side' of the southern land very nearly as it 

 appeared from the anchorage. 



