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3)
Rotate the stage about
1800,
and the target
is displaced from
the center of the cross
lines. Move the objective using the center-
ing tools so that the center of the cross
Iines comes to one half position
of the
displacement of the target. (F ig. 15)
Rotate
1800
Target-
A half
position
of the
displacement
Image of field
[~:a~~~~~~
~'\
)
,,>J
":/
Eyepiece
viewfield stop
Fig. 16
Fig. 15
•
Repeat the above procedure two or three
times, and the rotation
center of the stage
coincides with the cross Iines center .
•
Carry out centering for each objective.
6.
Centering the Condenser Lens
1) Close the field
diaphragm
in the micro-
scope base to its smallest size by means of
the field diaphragm
control
ring. Rotate
the condenser
focus knob
to move the
condenser vertically
so that a sharp image
of the field diaphragm
is formed on the
specimen surface.
2)
Bring the field
diaphragm
image to the
center of the field of view by means of
the condenser centering screws.
(Fig.
16-1IJ)
3) Change over to the objective
40 x,
and
adjust
the
field
diaphragm
so that
the
image of the diaphragm is about the same
as the eyepiece viewfield stop, as shown in
Fig.
16-~.
If not centered, use the con-
denser centering screws again.