With your microscope focused under low
power, hold a sharply pointed pencil or
pen over the top of the light source at
the bottom of your microscope. The
point of the pencil should be at the
center of the light source.
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Raise
or lower the condenser until the
shadow of the pencil point comes
into focus through the oculars.
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The
microscope is now "Kohlered" and is
operating at maximal resolution. Always
make sure that your microscope is
Kohlered before making any critical
examinations.
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