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30
Jeg liar foretrukket den først beskrevne Methode for at
kunne holde Deviation og Misvisning ud fra hinanden.
Beregningerne udførtes efter nedenstaaende Skema og
Exempel.
1877. Juni 16. Klokkeslet. 5 am. 6 am. 7 am. 8 am. 9 am. MD. 3pm. Hour. 1877. June 16.
Observeret Kurs N35BE s 45° W s 45° W S 58" W S 28° W S 78» W S45°E Ship’s Head by C.
Misvisende Kurs N 22° E S 66° W S 66» W s 80° w s 45° w X 8i° W SS9°E Do. true Magnetic Course.
Log. Meter pr. See. 3-8 0. °-3 0. 2.2 0. 4-4 Log. Metres per Second.
Observ. Vind-Retn. p. C. S 85° W S 2 5° W S 30° W S 26° W S 28° W S 33° W S 33° W Observed Direction of Wind by C.
Deviation - 13° + 21» + 21» + 22» + 16» + 21» . -14° Deviation.
Misv. Vindretning ombord S 7 2° W S 46° w S 5i°W S 48°W S 44°W S54°W S 2 1° W Obs. true Magnetic Dir. of Wind.
()bs. Vindhastig.Meter pr. See. 4-9 5-6 7-9 8.4 11.4 12.0 9.8 Observed Velocity of Wind.
Construeret misv. Vindretn. S 50" W S 46° w S 50» W S 48» W S 44° W S 54° W S 47° W Constructed Magn. Direction of Wind.
Misvisning — 19° — 19° —19° -19° — 19° -19° -19° Variation of Compass.
Retvisende Vindretn. i Grader S3I°W s 270 w S 3i°W S 29°W S25»W S 35°W S 28°W True Direction of Wind.
,. Streger sw*s ssw SWjS SW(S ssw swjs SWiS Do. in Points.
Sand Vindhastighed. Meter pr. See. 7-9 5.6 7.6 8.4 9.2 12.0 10.0 True Velocity of Wind.
Metres per Second.
Man ser af dette .Exempel, hvorledes man kommer
tilbage til den samme Vindretning, uanseet de Variationer,
som optræde i de observerede Værdier af Skibets og
Vindens Hastiglied og Retning.
Den i Grader opførte Vindretning omgjordes til
Streger efter følgende Tabel.
From the above, it appears that the same result is
obtained for the direction of the wind, notwithstanding the
variation that occurs in the observed values for the speed
and direction of the vessel and the velocity and direction
of the wind.
The direction of the wind, expressed in degrees, was
converted into points, according to the following Table.
N 6°W — N 6»E=N
N 6 E —N 17 E =NjB
N17 E — N28 E=NNE
N 28 E -N39 E=NEiN
X 39 E — N 51 E — NE
N51 E — N62 E=NEsE
N62 E - N 73 E =ENE
N73 E — N84 E=ESN
N 84°E — S 84°E =E
S 84 E — S 73 E =E,,S
S 73 E - S 62 E =ESE
S 62 E — S 51 E =SEiE
S 51 E — S 39 E=SE
S 39 E —S 28 E =SE4S
S 28 E — S 17 E = SSE
S 17 E —S 6 E=SsE
IS 6°E — S 6»W = S
S 6 W —S 17 W=S»W
S 17 W —S 28 W=SSW
s28 W-S39 w = swts
S39 w — S51 w = sw
1S51 w -S62 w = swsw
s 62 w —s 73 w=wsw
s 73 w —s 84 w = wss
I s 84» W — N 84» W = W
N 84 W — N73 W = WSN
X 73 W — N 62 W=WN\V
N62 W —N51 W = NWjW
N 51 W-N 39 W = NW
N39 W — X 28 W = NWjN
N28 W — N 17 W = SNW
N 17 W —N 6 W = NSW
Vindens Styrke forsøgtes noteret efter Beaufort Scale.
Det viste sig imidlertid, at Iagttagerne, uden Vejledning
som de i Regelen vare af Sejlføring paa Skibet, ikke
formaaede at notere endog nogenlunde rigtig. Denne
Observation opgaves derfor, og er ikke medtaget i
Observations-tabellerne.
The force of the wind was noted, so far as possible,
by the Beaufort Scale. Meanwhile, it was found that the
observers, without assistance as they were from the spread
of canvas carried by the vessel, could not note the force
with even comparative accuracy. Such observations,
therefore, were relinquished, and will not be found in the Tables.
described above, in order to keep apart the deviation and
the variation.
The computations were made as shown below.
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