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L699 – THE LINDBERGH HOUR ANGLE WATCH Selvopptrekkende ur
Slik bruker du ditt The Lindbergh Hour Angle Watch
Du har stilt klokken etter et tidssignal. Vi tar som utgangspunkt at
uret viser 4 timer, 37 minutter og 12sekunder. Tidsjevningen for den
aktuelle dagen er minus 4 minutter og 50 sekunder.
Flytt stiften, som står på ”15” på bezelringen, re enheter mot venstre.
Disse enhetene representerer minuttene inngravert rundt urkassen.
Dine avlesninger:
Sekundviser (indre tallskive) 3’
Minuttviser (bezelring) 10° 15’
Timeviser (hovedtallskive) 60°
Da du bare  yttet bezelringen  re minutter,
mådu fremdeles ta hensyn til de 50sekundene
(husk at tidsjevningen for den aktuelle dagen er
4minutter og 50sekunder).
På den indre tallskiven står 50 midt imot 12½ . /. 12½’
Greenwich-timevinkel for solen
(din lengdegrad) 70° 5½’
Slik fungerer rom-/tidsskiven
Utformingen av Lindbergh Hour Angle Watch er basert på det faktum
at jorden roterer 360° i døgnet, 180° på 12 timer, 15° i timen og
med 15’ bueminutter i minuttet.
Derfor viser uret følgende opplysninger:
Timeviseren viser 15° per time. En hel omdreining av skiven (12timer)
tilsvarer 180°.
Minuttviseren viser 1° per 4 minutter eller 15° per time. Hver av de
15° er inndelt i re enheter 15’ bueminutter. Alle disse indika-
sjonene er inngravert på den roterende bezelringen.
En hel omdreining av den indre sekundviseren tilsvarer 15’ bueminut-
ter. Den roterende indre skiven er inndelt i 60” og 15’ bueminutter.
Book_I.indb 558Book_I.indb 558 27.01.20 09:5127.01.20 09:51
558


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