Betzold 85908 Mode D'emploi page 9

c) Components of the Betzold Microscope for Beginners
Carefully study the picture, and get yourself acquainted with the different components of your microscope.
d) Accessories
- 5 empty slide holders
- prepared slide holders
- 1 slide holder with dip
- labels for slide holders
- cover glasses
Attention! The set contains food colour and sharp instruments! Children are only allowed to do experiments and slide
preparations when supervised by adults!
Instructions
a) Preparation
Please read this text carefully before using the microscope. Familiarise yourself with the individual components of the
microscope.
Installing the batteries:
Detach the eyepiece from the lens tube and turn the microscope. Open the battery holder at the bottom and insert 3 batteries
type AA (Mignon LR6) (not included) as indicated. Shut the battery holder and reinstall the eyepiece.
Always place your microscope on an even surface, i.e. a table.
The Betzold Microscope for Beginners enables you to light the object from above or from below. Note that the switch at the
back of the microscope serves for both, the transmitted as well as the reflected light, depending on the direction into which
you turn it. The two lights cannot be used at the same time.
The lens tube and the top can be turned in such a way that they, if wanted, point to the other side of the microscope. If
necessary, you can LIGHTLY turn the screw at the top base to make the turning of the top easier. For best results the top
should only be moved when it is absolutely necessary.
b) Work with transmitted light: Use of the bottom light source
(for slide preparations on slide holders)
Put the stage into its lowest position. Always begin your observations with the 4x objective and increase the magnification
gradually. Start with a prepared object holder and place it cautiously on the stage, the labelled side towards the top. Press
the clamping device lightly in order to lift it up; to be able to fasten the object holder underneath. The part to be observed of
the object should be placed on the opening in the stage. Use the switch for the bottom light so that it shines through the
opening and through the object holder onto the stage. Look through the eyepiece and turn the focus knob SLOWLY, until the
object can be seen clearly. Make sure the object holder does not touch the objective.
Hints for working with transmitted light:
- The orifice plate which sits directly under the stage has 6 different openings, which are used to control the light quantity.
The turning of this disc enables you to change the intensity of the light. Try to experiment with the different possibilities
of adjustment to get the best sight.
- After adjustment you can move the object holder to the left and to the right on the stage to observe different areas of
the object. When you are adjusting the object holder or the disc, pay attention not to put any pressure, which could
move the specimen onto the stage. In case this should happen all the same, simply readjust the focus knobs until you
can see the object again clearly.
- After having looked at the 40x magnified specimen, (4x objective) you turn the objective turret to the 10x objective.
(The object holder stays on the stage.) When SLOWLY turning the focus knob now you will be able to see your
specimen magnified 100x. Always be very cautious and take care that the object holder does not touch the objective.
Finally you can turn the objective turret to the 40x lens, which gives you a 400x magnification of your specimen.
Whenever you increase, consider: The bigger the magnification, the nearer the lens must be to the object.
The 40x objective almost seems to touch the lens; that is normal. Always move the focus knobs very slowly.
- When changing the object holder, put the stage into its lowest position. Lift the clips and remove the object holder.
In order to fasten the new object holder, simply lift the clips again and push the object holder carefully underneath.
Begin your observations again with the 4x objective.
- pipette
- 2 small bottles of non poisonous
colouring liquid
- tweezers
- special cleaning paper for lenses
- test tubes
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