Bresser Junior 8851301 Instrucciones De Uso página 10

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 (9) below the microscope stage (4) will
help you in viewing very bright or clear-sighted preparations. Turn the
wheel (9) till the best contrast is achieved.
4. Observation (electronic light source)
Remove and insert batteries
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 Phillips
screwdriver. Insert the batteries with the correct polarity (+/- indication).
Put the battery cover first into the small opening so that the lid fits per-
fectly. 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.
10
TIP: The higher the magnification you use the more light is required for
a good illumination of the picture. Therefore, always start your experi-
ments with a low magnification.
5. Condition and prepare viewed objects
This microscope features transmitted light, so that transparent speci- mens can be examined.
If opaque specimens are being examined, the light from below goes
through the specimen, lens and eyepiece to the eye and is magnified en
route (direct light principle).
Some small water organisms, plant parts and animal components are
transparent by nature, but many others require pretreatment — that is,
you need to make a thinnest possible slice of the object by hand cutting
or using a microtome, and then examine this sample.
6. Experiments
Use the following web link to find interesting experiments you can try out.
http://www.bresser.de/downloads
Microscope accessories can be found here:
http://www.bresser.de/P8859480