Bresser National Geographic 40X-640X Bedienungsanleitung Seite 12

3. Normal observation
For normal observation, place the microscope in a bright location (near a window or desk lamp, for
example).
Turn the focus knob (2) to the upper stop, and set the objective turret (3) to the lowest magnification.
Now, turn on the light using the switch on the microscope base. 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 (1). When you take a look through the eyepiece, you can see the magnified speci-
men. 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 selecting 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.
The wheel with pinhole apertures (13) below the microscope stage (4) will help you in viewing very
bright or clear-sighted preparations. Turn the wheel (13) till the best contrast is achieved.
4. Observation (electronic light source)
For observation with the electronic light source (6) you need to insert 2 AA batteries 1.5 V, in the bat-
tery compartment (8) on the base of the microscope (7). The battery compartment is opened using a
Phillips screwdriver. Insert the batteries with the correct polarity (+/- indication). Put the battery cover
fi rst into the small opening so that the lid fi ts perfectly. Now you can tighten the screw. The lighting
is switched on when you turn the switch on the microscope base. Now you can observe in the same
way as described in the previous section.
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