20 



Tallene i den sidste Eubrik. den devierende Misvis- 

 ning', afsattes som Ordinater paa Kudepapir, med Tallene 

 i den anden Eubrik, anlagt Kurs paa Standard-Kompas, 

 som Argument. Paa grafisk Vej droges mellem de afsatte 

 Punkter den sandsynligste Kurve, og af denne Kurve ud- 

 toges følgende Værdier: C = Anlagt Kurs efter St. Kom- 

 passet. D = Devierende Misvisning 



Tbe figures in tbe last column, tbe deviating varia- 

 tion, were set down as ordinates on ruled paper, with the 

 tigures in the second column as abscissæ. A free band 

 curve was tben drawu as nearly as possible tbrough all 

 the marked porats, and from this curve were deduced the 

 following values (C signifies -'course by compass;" D, "de- 

 viating variation"): — 



Medium af de devierende Misvisninger i denne Tabel er 



18.° 68 West. 



Ifølge Side 7 var Middel-Misvisningen paa Teltpladsen 

 paa samme Tid 18° 14/7 = 18°.24. 



Paa Skjæret østenfor Havnen fandt Prof. Mobn (Side 

 11) den 16de Juni Misvisningen om Formiddagen = 19" 

 0', om Ettermiddagen 18" 2', i Middel 18" 31' = 18°.52. 

 Da Fartøjet under Svingningen laa mellem Teltpladsen og 

 Skjæret, turde det være rigtigst at sætte Misvisningen paa 

 Skibets Plads lig 



18.°38 West. 



Dette Tal er kun 0.°30 mindre end Middeltallet af 

 de devierende Misvisninger ombord. Det sidste giver saa- 

 ledes den sande Misvisning med en Nøjagt/ighed af mindst 

 en halv Grad. Efter dette Princip udførtes Misvisnings- 

 bestemmelserue i Søen. Til Bedømmelse af Skibets mag- 

 netiske Forhold hidsættes de beregnede Værdier for Kon- 

 stanterne i Deviations-Formelen. 



The mean ol deviating variation in this Table is 

 18.°68 W. 



As previously shown. pagell. the mean declination si- 

 multaneously found at the tent was 18" 14/7 — 18. "24. 



On the islet east of the harbour. Professor Mobn 

 found the declination in the forenoon of the 16th of June 

 = 19° 0', in the afternoon 18° 2', giving a mean of 18° 

 31' = 18. "52. Now, as the vessel lay when swinging be- 

 tween the tent and the islet, the declination for -the ships 

 position may be put at 



18."38 W. 



This value is only 0.°30 less than the mean oj the 

 deviating variations obserred on board. Hence, this mean 

 gives the true variation within half a degree. Onthisprin- 

 ciple was determined the variation at sea. To show the 

 magnetic influence of the vessel, the computed values of 

 the constants in the deviation formula are here given. — 



0.°0; B = -- 18."47; C = — U."4o : D = +2/47; E = -f 0.°23. 



Deviationen er for anlagt Kurs Nord og Syd, 

 Maximum, 18. "5, for Ost og West. 



Misvisnings-Bestemmelserne i Søen udførtes paa føl- 

 gende Maade. Skibet blev, i roligt Vejr og under Solskin, 

 ved Maskine og Ror bragt til at ligge an forskjellige, i 

 Eegelen 16. Kurser, saa jevnt som muligt fordelte over 

 hele Horizonten. For hver af disse anlagte Kurser bestem- 

 tes Vinkelen mellem Diametralplanet og Sulens Vertikal- 



The deviation is with the ship's head due north or 

 south, its maximum with the ships head due east or west 

 being 18,"5. 



The determinations oi' declination at sea were per- 

 formed as follows: — In calm, bright weather the sbip's 

 head was brought upon different points of the compass. as 

 a rule 16. as regularly distributed round the circumference 

 as pnssible. Kor each of these points was determined the 

 angle between the midship line and the vertical circle of 



