Bresser National Geographic 91-19501 Mode D'emploi page 13

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.
5. Smartphone holder
Attach the smartphone holder to the eyepiece.
The suction cups must be clean and free from dust and dirt. A slight moistening is helpful.
Now press your smartphone on the retaining plate and make sure that it is properly secured.
As a backup, you should secure it with the enclosed rubber strap.
Smartphones with a rough surface will not hold as good as smartphones with a smooth surface.
Now start the Camera app.
The camera needs to rest just above the eyepiece. Center the smartphone exactly over the eyepiece,
so the image can be seen precisely centered on your screen.
In some cases you need to adjust with the zoom function to display the image fullscreen. A light shading
at the edges is possible.
Take the smartphone carefully off the holder after use.
NOTE:
Make sure that the smartphone can not slip out of the holder.
Bresser GmbH assumes no liability for any damages caused by a dropped smartphone.
6. Condition and prepare viewed objects
6.1. Condition
This microscope features transmitted light, so that transparent specimens 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 magnifi ed 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.
6.2. Creation of thin preparation cuts
Specimens should be sliced as thin as possible. A little wax or paraffi n is needed to achieve the best
results. Put the wax into a heat-safe bowl and heat it over a fl ame until the wax is melted. You can use
a candle fl ame to melt the wax.
DANGER!
Be exremely carfeful when dealing with hot wax, as there is a danger of being burned.
Then, dip the specimen several times in the liquid wax. Allow the wax that encases the specimen to
harden. Use a MicroCut or other small knife or scalpel to make very thin slices of the object in its wax
casing.
EN
13