Bresser Junior 40x-640x Mode D'emploi page 14

6.2. Textile fibres
Objects and accessories:
1. T hreads of different textiles: Cotton, linen, wool, silk, Celanese, ny-
lon and any others you can find.
2. Two needles:
Put each thread on a glass slide and fray each with the help of the
two needles. Put a drop of water over each thread with the pipette
and cover each with a cover glass. Adjust the microscope to a low
magnification. Cotton fibres are of plant origin and look, under the mi-
croscope, like a flat, twisted band. The fibres are thicker and rounder
at the edges than in the centre. Cotton fibres consist primarily of long,
collapsed tubes. Linen fibres are also of plant origin; they are round
and run in straight lines. The fibres shine like silk and exhibit numer-
ous swellings along the shaft of the fibre. Silk is of animal origin and
consists of solid fibres of smaller diameter than the hollow vegetable
fibres. Each silk fibre is smooth and even and has the appearance of
a small glass rod. Wool fibres are also of animal origin; the surface
consists of overlapping scales, which appear broken and wavy. If pos-
sible, compare wool fibres from different weaving mills, and note the
differences in the appearance of the fibres. Experts can determine the
country of origin of wool based on its appearance under a microscope.
Celanese is artificially manufactured by a long chemical process. All
Celanese fibres show hard, dark lines on a smooth, shining surface.
The fibres crinkle in the same way after drying. Observe the similarities
and differences between the different fibres.
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Notes on Cleaning
• Before cleaning the device, disconnect it from the power supply by
removing the batteries.
• Only use a dry cloth to clean the exterior of the device. To avoid
damaging the electronics, do not use any cleaning fluid.
• Protect the device from dust and moisture.
• The batteries should be removed from the unit if it has not been used
for a long time.
EC Declaration of Conformity
Bresser GmbH has issued a 'Declaration of Conformity' in
accordance with applicable guidelines and corresponding
standards. This can be viewed any time upon request.
Disposal
Dispose of the packaging materials properly, according to their
type, such as paper or cardboard. Contact your local waste-dis-
posal service or environmental authority for information on the proper
disposal.
Do not dispose of electronic devices in the household garbage!
As per Directive 2002/96/EC of the European Parliament on
waste electrical and electronic equipment and its adaptation into
German law, used electronic devices must be collected separately and
recycled in an environmentally friendly manner. Empty, old batteries
must be disposed of at battery collection points by the consumer. You
can find out more information about the disposal of devices or batteries
produced after 6 January 2006 from your local waste-disposal service
or environmental authority.