31
Fig. 23
1 Object holder (clamp screw), 2 Centering keys* for
condenser disc*, cf Fig. 9, 3 Condenser height adjustment, bi-
lateral control, 4 Adjustable condenser height stop, 5 Coarse
and fine focusing, 6 Lamp brightness control (transmitted
light); the mains switch with pilot lamp is on the right side of
the microscope base, 7 Aperture diaphragm, cf Fig. 7,
8 Condenser disc* for UCL condenser, 9 Condenser centering,
10 Field diaphragm
Fig. 24 Koehler illumination
a Field diaphragm not focused, not centered, b Field
diaphragm focused, but not centered, c Field diaphragm
focused and centered, but diameter too small, d Field
diameter = field of view diameter (Koehler illumination)
1
2
7
3
4
6
2
5
8
10
9
ab
cd
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