The Guide of Observation Box for
Brownian motion of smoke particles.
Features:
This apparatus is used to observe ‘Brownian motion’ of smoke
particles. The apparatus use laser light source instead of a low
voltage festoon bulb . This innovation leads to more sharp
focusing of image is obtained and no external power source is
needed. Only two AA batteries are fixed in a small plastic box
that permits easy attachments of standard microscopes. The
apparatus consists of a glass smoke cell , a cylindrical Whitley
Bay pattern condensing lens and a laser source. The specially
designed groove on the tope of smoke cell seals smoke cell to
prevent the escape of smoke from the cell. The components
are pre-adjusted so as to focus the light at the correct height
in relation to the smoke cell, ensuring that observation is
enhanced. Students can directly observe Brownian motion of
smoke particles in this small box on the platform of
microscope. By using a special DV camera fixed on the eye
lens of microscope teacher can demonstrate Brownian motion
on the screen of computer or big screen of project.
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Dimensions:
( diagram & photos)
Guide of Operation
1. Microscope ×10 objective lens and ×10 eye lens or ×10
objective lens and ×16 eye lens
2. Remove the glass lid of smoke cell and fill several drops of
glycerin or clean water in the seal groove. Squeeze some
smock with a straw into the smoke cell. Cover the glass lid
on the smoke cell immediately and press it.
3. Switch on the power to light the smoke cell with red light
of laser
4. Put the box on the platform of microscope and let the
smoke cell directly under the objective lens. Slightly move
the box for viewing access.
5. Slow raise the tube of microscope using it’s knob and view
from the eye lens until some bright tiny particles of smoke
appear in your view. Adjust the microscope slightly to
focus smoke particles clearly. You can view the random
motion of smoke particles in the air of smoke cell.
Maintain
1. Clean the smoke cell after each observation
2. Keep the glass lid of smoke cell clean and smooth.
3. Keep the seal groove on the tope of smoke cell clean.
4. Remove the battery after observation