DAVIS Mark 15, 25 Sextant - Manual (Page 5)

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Using the Light on the Davis Mark 25 Sextant
The Mark 25 is specially constructed with a solid state light emitting diode (LED)
and light guide to allow easy reading of the scales at twilight.
To use the light:
Make sure that your eyes are dark-adapted before using the light.
Press the button at the top of the handle.
The light turns off when the button is released.
Note: The high-efficiency LED configuration was developed to insure long battery
life (as much as ten times longer than with regular bulbs). Nevertheless, all batter-
ies eventually run down. When not using your sextant for long periods of time,
remove the batteries by unscrewing the black plastic screw in the handle. Battery
contacts can be easily cleaned with a small file or knife blade. Replacements, if
needed, are ordinary zinc-carbon or alkaline batteries, 1.5 volt, size AAA. Batteries
that start to leak should be removed immediately. After replacing the batteries, be
sure to fit the handle together again carefully, and replace the screw snugly but not
too tight.
CAUTION: Do not attempt to snap the assembled sight tube into or out of the
mounting bracket. Separate the sight tube from the eyepiece by carefully slid-
ing the eyepiece out of the bracket and from the rear only. Insert the scope
from the front only.
Inserting the 3X Telescope
Your sextant comes equipped with a high quality 3X telescope. The scope is inter-
changeable with the hooded sight tube.
To remove the sight tube from its mounting bracket on the sextant:
Separate the tube from the eye-piece as shown in Fig. 2 below.
Figure 2