36 



i Numerfølge, I. II, III, og indsigtedes ved Øjemaal i 

 Limen. 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- 

 liugen kunde saaledes paa det flade Terræn blive ret nøj- 

 agtig. Grundliniens hele Længde fandtes ved Hjelp af 

 Stamperne og et Meterruaal at være 299.11 Meter. Nogen 

 merkelig Eeduction for Stængernes Heldning har jeg ikke 

 fuudet det praktisk nødvendigt at anbringe. Metermaalet. 

 der anvendtes som Normalmaal, er et i Paris kjøbt, med 

 Regjerings-Stempel 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 imøjagtige Orientering fremkomne 

 Fejl. Efter Afslutningen af Grundliniemaalingen opsatte 

 jeg Signalerne Y. T og videre vestover. 



Den 21de August beregnedes Gaarsdagens Observa- 

 tioner og afsattes i Kartet. Gapt. Grieg foretog Lodninger 

 i Advent Bay. Om Ettermiddagen maalte jeg Vinkler fra 

 di' Signaler, jeg havde opsat den forrige Ettermiddag. 



Den 22de fortsatte Capt. Wille Kaitarbejdet. Gapt. 

 Grieg loddede om Formiddagen, og Capt. Wille om Etter- 

 middagen. Kl. (3 Elt. lettede vi og sejlede ud Isfjorden. 



Kartet over Advent Bay er tegnet af Capt. Wille. 

 Det originale Kart i 1 : 30000 er gjengivet her 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. Azi- 

 niutbestemmelsen, der orienterer Kartet, antages sikker paa 

 et Minut, og Længdeudstrækningerne sikre paa en to- 

 tusindedel af samme. Angaaende den absolute Bredde og 

 Længde henvises til min Afhandling om de astronomiske 

 Observationer Side 19. 



Forresten indeholder Kartet selv de nødvendige Op- 

 lysninger. 



boatswain and a sailor. so as to extend one after the other 

 (I, II, III) from Base B. and as nearly as the eve 

 could determine in the time line. There was a light breeze 

 blowing at right angles to the base line. and the opera- 

 tion could be easily performed by commanding "luff' and 

 "off." When the rods w ere being moved, I put my foot 

 on the last of tliem, keeping it there till the next bad 

 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. Auy appreciable reduction for the inclina- 

 tion 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 2 Ist of August, the observations tåken the 

 day before were computed and laid down on the Map, 

 Gapt. Grieg sounded in the Bay. In the afternoon I 

 measured angles from the signals I had erected on the 

 previous day. 



On the 22nd, Gapt. Wille went on eonstructing 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 tj-jt.Itut ; 



the scale of that annexed to this Memoir is 



ao.tnnr- 



As 



will appear from the above description, the Map of Advent 

 Bay is based on a complete triangulation. The trigono- 

 metrical points are denoted by capital letters. The azimuth 

 determination. on which is based the direction of the meri- 

 dian 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 abso- 

 lute 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 teonede af Landskabsmaler Carl 

 Nielsen, efter Skitser tagne paa Stedet af Hr. F. W. Schiertz, Prof. 

 G. O. Sårs os Prof. II. Mohn. 



Pigs. 1 to !* are drawn liv Carl Nielsen, artist, from sketchea 

 tåken on the sjx >t liv F. W. Schiertz. artist tu the Ex]ie<litiun. 1 ' i -< . I . 

 G. O. Sårs. and Prof. H. Mohn. 



Translated into English by John Hazeland. 



