National Geographic BRESSER 300X-1200X Mode D'emploi page 9

EN
2. Assembly and location
Before you start, choose an ideal location for using your microscope. It's important that you choose
a spot with enough light for normal observation. Furthermore, it is recommended that you place the
microscope on a stable surface, because a shaky surface will not lead to satisfactory results.
3. Normal observation
For normal observation, place the microscope in a bright location (near a window or desk lamp, for
example). Remove the microscope from the package and tilt the microscope arm (9) so that it's in a
comfortable viewing position for you.
Turn the focus knob (2) to the upper stop, and set the objective turret (3) to the lowest magnification.
Now, take a look through the eyepiece and adjust the mirror (5) so that you see a uniform bright circle
of light. Or, you can use the electronic light source (6). You'll find further tips about the light source
in the next section. Now, place a prepared slide (10) under the clips on the stage (4), directly under
the objective. When you take a look through the eyepiece, you can see the magnified specimen. At
this point, you still might see a slightly fuzzy picture. Adjust the image sharpness by slowly turning the
focus knob (2). You can now select a higher magnification by turning the objective turret and select-
ing a different objective.
When you do so, note that the sharpness of the picture must be adjusted again for the higher mag-
nification. Also, the higher the magnification, the more light you will need for good illumination of the
picture.
TIP: Avoid positioning the mirror so that it is exposed to direct sunlight, since it can cause a glare,
which won't allow you to get a clear picture.
4. Observation (electronic light source)
To use the electronic light source (6), you need to install two 1.5 V batteries in the base of the micro-
scope (7). Remove the rubber base (8) on the microscope and insert the batteries according to the
displayed +/- information. Reattach the rubber base to the microscope.
You can turn on the light by rotating it in the direction of the stage (4). Take a look through the eye-
piece and adjust the light so that you get optimal picture brightness. Now you can observe in the
same way as described in the previous section.
The bulbs for the electronic light can be replaced. One replacement bulb (13) is included. When you
use another bulb, make sure to pay attention to the maximum wattage, which is displayed on the lamp
body.
TIP: The higher the magnification you use the more light is required for a good illumination of the pic-
ture. Therefore, always start your experiments with a low magnification.
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