Bresser Junior 40x-640x Mode D'emploi page 11

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 mi-
croscope 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).
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 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 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 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 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 prepara-
tions. 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
3 AA batteries 1.5 V, in the battery compartment (8) on the base of
the microscope (7). The battery compartment is opened using a Phil-
lips screwdriver. Insert the batteries with the correct polarity (+/- in-
dication). Put the battery cover first into the small opening so that the
lid fits perfectly. Now you can tighten the screw.
The lighting is switched on when you turn the switch on the micro-
scope base.
Now you can observe in the same way as described in the previous
section.
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.
GB
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