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Self-winding watches
L614, L699 – THE LINDBERGH HOUR ANGLE WATCH
The original Lindbergh Hour Angle Watch was designed
by Charles Lindbergh as a navigational aid for pilots. Used
with a sextant and a nautical almanac, this watch en-
ables the wearer to quickly determine the hour angle from
Greenwich, in other words his or her longitude.
Thanks to its ingenious combination of dials, this time-
piece differs from an ordinary watch in three ways:
A
The indications on the dial are designed in such a way
that they show simultaneously the time (in hours, min-
utes and seconds) and the hour angle (in degrees and
minutes of arc).
B
The rotating central dial shows the seconds and it can
be turned using the crown in order to synchronise the
watch with a time signal.
C
The bezel can be rotated to correct the equation of
time (which varies from one day to the next).
3-position crown
Winding
(crown pushed right in)
The natural movements of your wrist will automatically
wind your Longines watch, which has a power-reserve
of 42 hours. It is only necessary to wind the watch man-
ually if it has not been worn for several days.
Adjusting the time and stop seconds
Pull the crown right out to position
3
. The seconds hand
will now stop. Adjust the time by turning the crown in
either direction. Synchronise the watch with a time sig-
nal (telephone, radio, TV) and then push the crown back
in to position
1
.
Synchronising the watch with a time signal
In the intermediate position
2
, the crown can be used
to turn the central dial (in either direction). Pull the crown
out to the intermediate position
2
and turn the central
dial so that the seconds hand points to the “60/15” po-
sition on the last pip of the time signal. Push the crown
back in to position
1
.
Push-piece D at 4 o’clock
This is for opening the case back, thus revealing the
movement through a protective sapphire glass.
The space/time dial and how it works
The design of the whole of The Lindbergh Hour Angle
Watch takes into account the fact that the Earth revolves
through 360° in 24 hours, through 180° in 12 hours,
through 15° in 1 hour and through 15’ of arc in 1 minute.
L614, L699
Anglais ME Longines
7.4.2010
11:44
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