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I. Bergen.
I. Bergen.
Ved Observatoriet paa X ordnes. Bredde ff = 60° 23’ 54",
Længde Å rr 5° 24’ 0" E. Greenwich.
. Horizontal-Intensitet.
1876, Ma 22.
Afbøjnings-Observation Kl. 12 tiT 1,30 Min. Eft.
Temperatur t — 62.°5 F. Afbøjningsvinkel. for
Afstanden r0 = 1 Fod, uo = 28° 58’ 55". Iagttager C.
Wille.
Svingnings-Observation Kl. 2,6 Min. til 2.18 Min. Eft.
Temperatur tn = 65.°5 F. Observeret Svingetid T0
:=: 4/4919. Kronometret vinder daglig 3*. Halve
Svingebue ved Begyndelsen a — 77.’9. ved Enden a’ — 24/7.
Torsion for en Dreining af 90". u — 11.’78. Iagttager
C. Wille.
Resultat. Med P" = 0.02300 faaes m = 0.76660 og
Horizontalintensitet X 3.2238.
Inklination. ’
Kl. 3.0 til 4.30 Min. Eft, Naal No. 1. C. Wille.
Resultat. H - 72° 24/3.
Observatory at Nordnes; latitude ff = 60° 23’ 54",
longitude I — 5" 24’ 0" E. Greenwich.
Horizontal Intensity.
1876, May 22.
Observation of Deflection: 12 a. m. to 1,30 p. m.
Temperature t0 — 62.°5 F.; angle of deflection for
the distance ro — 1 foot, un tr 28° 58’ 55". Observer
C. Wille.
Observation of Vibration: 2,6 p. m. to 2,18 p. m.
Temperature t0 = 65.°5 F.: observed time of one
vibration To =: 4/4919; chronometer gaining daily 3’.
Semi-arc of vibration at commencement a z= 77/9, at end «’ =
24/7. Torsion for a twist of 90°, u == 11/78. Observer
C. Wille.
Result. — With P = 0.02300, m will be = 0.76660
and the horizontal intensity X = 3.2238.
Inclination.
3,0 p. m. to 4,30 p. m. Needle No. 1. Observer
C. Wille.
Result. — H - 72° 24/3.
2. HUSH.
cf — 60° 59/6: ’L — 4n 37’ E. Greenwich.
u. Teltplads paa Øen. hvor Hr. Lexaus Hus staar.
Deklination. 1876, Juni 10, fandtes ved
korresponderende Højder af Prof. Mohn1 Kronometret Mewes 575
at være 0* 28"1 30’ foran Stedets Middeltid og dets daglige
Acceleration 5/93.
Samme Dags Eftermiddag bestemtes fra Teltpladsen
Azimut af "Poldetind’\ en Fjeldtop med Varde paa Indre
Sulen, der ligger i en Afstand af 18.57 Kilometer fra
Husø. Der observeredes i 3 Satser (I, H og III) med
Cirkelens Nulpunkt i 3 forskjellige Stillinger, og i hver
Sats Omlægning af Kikkerten gjennem Zenit (1 og 2).
O = Object = Poldetinds Varde, o = Cirkelaflæsning
for Solens Centrum. Ch. r= Kronometertid. O, =
Foran-gaaende Solrand. jo n Efterfølgende Soli-and. U =
Uhr-korrektion. M. T. = Middeltid. E =: Tidsjevning. t =r
Sand Soltid. () = Solens Deklination. (p — Bredden,
a = Solens Azimut. N. P. = Cirkelens Nordpunkt. A =
Azimut af Objektet.
2. Husø.
(p = 60° 59/6; l — 4° 37’ E. Greenwich.
a. Tent on the main island, where
Mr. Lexau’s house stands.
Declination. — On the 1 Oth of June, 1876, Professor
Mohn1 found the error of the chronometer, Mewes, No.
575, from equal altitudes, to be O’* 28m 30’ fast on local
mean time, and its daily acceleration 5/93.
In the afternoon of the same day, the azimuth of
"Poldetind," a mountain-top with a trigonometrical signal,
on the island of Indre Sulen, distant from Husø 18.57
kilometres, was determined from the tent. We observed
in three séts (I, II. and III), with the zero-point of the
horizontal circle in three different positions, and for each
set reversing the telescope through the zenith (1 and 2).
0 = object- =: Poldetind signal; O = reading of limb
corresponding to the sun’s centre; Ch =r time by
chronometer; ©j r= preceding solar limb: o = following solar
limb; U = error of chronometer; M. T. = mean time; E
— equation of time; t zr apparent solar time; ö =
declination of sun; ff = latitude; a = azimuth of sun; N. P.
—: circle reading corresponding to the astronomical
meridian (North Point); A = azimuth of object.
1 H. Mohn. Astr. Obs., Side.5.
H. Mohn. Astronomical Observations, p. 5.
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