Bresser 900x - Experiments and Slide Preparation; Observation Techniques

slowly turn the focus knob until the speci-
men can be seen in focus.
5. Observe what happens when you
slowly move the light source (Fig. 4) or the
mirror.
Adjust the mirror or light source to provide
the amount of light that gives you the best
image.
6. Look in the eyepiece and observe what
happens to the image when you move the
slide to the left and then to the right.
7. If you wish to increase magnication,
rotate the objective turret to a higher
power
and refocus. Practice rotating the turret to
change magnication.
Tip: Always keep both eyes open when
looking through the eyepiece. Doing so
will relieve stress on your eyes.
Don’t always assume that increasing mag-
nication will produce the best image for
viewing.
Each time you increase in magnication,
the amount of light decreases, and the
section of the image you are able to view
also decreases. This is desirable for some
specimens, but not for others.
Try Out the Color Filter
Locate the color lter located at the front
of the stage (Z, Fig. 1). Rotate the lter to
change lter colors.
Observe how the color lter affects your
view of the prepared slide. Next, take a
blank slide and place a few grains of salt
or sugar on it. Rotate the lter and see
how the ltered light enhances the image
of the salt or sugar.
Tip: Use the color lter especially when
looking at clear or dim specimens.
The Brine Shrimp Hatchery
Brine shrimp are tiny crustacean that
are ideal for study with a microscope.
Crustacean are sea creatures with hard
shells and antennae. Crabs and lobsters
are perhaps the most well-known crusta-
cean. Brine shrimp are the major part of
the diet of many sea creatures. The word
brine means water containing noticeable
amounts of
CAUTION: When you are
nished observing, be sure to
turn the light source around, if
necessary, so that it turns off
and doesn’t wear down the
batteries.
Remove the batteries before
storing the microscope for a
month or longer.
NOTE: The view presented in
the eyepiece is upside-down
and reversed from left to right
of the object. In other words,
if you wish to examine more
of the left side, move the slide
to the right. Or if you wish to
examine more of the top of the
image, move the slide down—
and vice-versa.
CAUTION: Be careful not
to touch the slide with the
objective lens. You can break
the slide and/or the lens by
touching the slide with the
lens.
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