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

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Thames & Kosmos

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ELECTRICAL TAPE METHOD:

Using a thick insulating tape

(electrical tape), wrap several layers

around the cutting edge on one side

of the razor blade.

BOTTLE CORK METHOD:

First, cut a slit lengthwise with a

knife in a bottle cork, down to the

middle. Insert the razor blade into

this slit. Then the blade can easily be

held by the cork handle.

How to cover the edge

of the razor blade:

The objects that you view under the microscope

will have to be very thin in order for enough light

to be able to shine through them. Some

specimens will have to first be cut into very thin

slices so you can study them under the

microscope in cross section.

To do this, use an ordinary double-edge safety

razor blade from the drugstore or supermarket.

Handle the sharp razor blade very carefully and

make it safer to hold by covering one of its edges,

using one of the methods described on the right.

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Many objects are naturally too thick to be placed under the

microscope in their entirety. At the same time, however, they are

ﬂimsy or thin enough to stubbornly avoid the razor blade when

trying to cut them. Here’s a tip for how to slice them:

1. Take an expanded polystyrene foam cube and cut a slit in the

top of it.

2. Carefully insert the specimen you want to cut (e.g., blade of

grass, piece of root, pine needle) into the slit. Make sure it’s as

straight as possible.

3. Slice into the foam cube with the razor blade from the side

and pull it laterally across the cube and through the specimen.

Make several cuts, one after the other. This increases the

likelihood of getting a perfectly thin cut.

WARNING:

Make sure you have an

adult help you prepare the razor

blade for use!

PROFESSIONAL CUTTING TIPS

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