Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding

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Thames & Kosmos

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Handleiding

The first specimen:

the skin of an onion

You will need

– Microscope

– Permanent prepared slide (onion skin

specimen)

– 2 AA batteries

– Small Phillips-head screwdriver

Here’s how

1. Before you start, have an adult insert the

batteries into your microscope. To do this, first

remove the plastic stopper from the tube.

Then turn the microscope upside down. The

battery compartment is on the bottom.

Unscrew the screw securing the battery

compartment with the help of a small Phillips-

head screwdriver. Lift up the lid and insert two

new AA batteries. Pay attention to the correct

polarity (see Figure 1). Then close the battery

compartment and tighten the screw.

2. Now put the eyepiece (also called the ocular)

in the tube. Turn on the illuminator with the

power switch on the base of the microscope.

The light shines through the hole in the stage.

Under the stage, you will find a round disc with

openings of different sizes. This is the

aperture wheel. You can turn it to control how

much light passes through the specimen on

your slide. Always choose the largest aperture

at the beginning.

1: Base

2: Arm

3: Illuminator (light source)

4: Mechanical stage with clips

and diaphragm

5: Three objective lens on

revolving nosepiece

6: Fine focus adjustment knob

7: Ocular (eyepiece)

8: Tube

9: Aperture wheel

10: Power switch

EXPERIMENT

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