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Brugsanvisning til
The Lindbergh Hour Angle Watch
Synkroniser uret med et tidsignal. Når du a æser ditur, viser det for
eksempel 4 timer, 37 minutter og 12 sekunder. Tidsækvationen for
den betragtede dag er minus 4 minutter og 50 sekunder.
Flyt derfor mærket, der sidder ved “15” yderringen, 4 enheder
mod venstre. Disse enheder, der svarer til minutterne, er indgraveret
på kanten af urkassen.
Dine data er som følger:
Sekundviser (central urskive) 3’
Minutviser (yderring) 10° 15’
Timeviser (hovedskive) 60°
Da du kun har drejet yderringen 4 minutter,
mangler du stadig at tage højde for de
50sekunder (idet tidsækvationen jo var på
minus 4 minutter og 50 sekunder for den
betragtede dag).
På den centrale urskive står 50 over for 12½ . /. 12½’
Angle horaire Greenwich du soleil
(din længdegrad) 70° 5½’
L699 – THE LINDBERGH HOUR ANGLE WATCH Automatiske ure
Rum/tid-urskiven, og hvordan den fungerer
The Lindbergh Hour Angle Watch er designet på baggrund af det
faktum, at jorden drejer 360° 24 timer, 180° på 12 timer, 15°
1 time og 15 bueminutter på 1 minut.
Følgelig:
Timeviseren bevæger sig 15° i timen. Et helt gennemløb af urskiven
(12 timer) svarer til 180°.
Minutviseren bevæger sig hvert 4. minut, med andre ord 15° i
timen. Hver af de 15° er inddelt i re sektorer på 15 bueminutter. Alle
disse angivelser er indgraveret på den drejelig yderring.
Den centrale sekundvisers gennemløb af en hel omgang svarer til
15 bueminutter. Den drejelige centrale urskive er inddelt i 60bues-
ekunder og 15 bueminutter.
Book_I.indb 470Book_I.indb 470 27.01.20 09:5127.01.20 09:51
470


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