Bresser NATIONAL GEOGRAPHIC 91-18002 Instrucciones De Uso página 8

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 satis-
factory 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 magnifi-
cation.
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 im-
age sharpness by slowly turning the focus knob (2). You can now select a higher magnification
by turning the objective turret and selecting a different objective.
When you do so, note that the sharpness of the picture must be adjusted again for the higher
magnification. Also, the higher the magnification, the more light you will need for good illumina-
tion 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
microscope (7). Remove the rubber base (8) on the microscope and insert the batteries ac-
cording 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
eyepiece 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 dis-
played on the lamp body.
TIP: The higher the magnification you use the more light is required for a good illumination of
the picture. Therefore, always start your experiments with a low magnification.
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