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Self-winding watches
L614, L699 – THE LINDBERGH HOUR ANGLE WATCH
Consequently:
The hour hand indicates 15° per hour. One complete cir-
cle of the dial (12 hours) is equivalent to 180°.
The minute hand indicates 1° per 4’, in other words 15°
per hour. Each of the 15° is subdivided into four sectors
of 15’ of arc. All these indications are engraved on the
rotating bezel.
One complete circle of the centre seconds is equivalent
to 15’ of arc. The rotating central dial is divided into 60’’
and 15’ of arc.
How to use your Lindbergh Hour Angle Watch
Having synchronised your watch with a time signal. As
an example when you check it your watch shows
4 hours, 37 minutes and 12 seconds. The equation of
time for the day in question is minus 4 minutes and
50 seconds.
Therefore move the marker situated at “15” on the bezel
4 graduations to the left. These graduations represent
the minutes engraved around the case.
Your data are as follows:
Seconds hand (centre dial)
3’
Minute hand (bezel)
10°
15’
Hour hand (main dial)
60°
As you have only turned the bezel by 4 min-
utes, you still have to take into account the
50 seconds (the equation of time being
4 minutes and 50 seconds for the day in
question).
On the central dial, the 50 is opposite 12½
. /.
12½’
Greenwich hour angle of the sun
(your longitude)
70° 5½’
Anglais ME Longines
7.4.2010
11:44
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