3
4
11.3 Supplementary Manual for Polarization Model 78904-33 (cont.)
Orthoscopic observation
Orthoscopic observation is available for 4x to 100x objectives
1.
Revolve the Bertrand lens dial (1) to “O” position in
order to remove the Bertrand lens from optical path
2.
Swing out the top lens of the condenser
3.
For reflected illumination system, the polarizer is fixed
and the analyzer can be rotated 360 degrees. Rotate
the analyzer (2) until complete extinction is obtained
4.
For transmitted illumination, the polarizer can be
rotated 360 degrees, turn it until complete extinction
is obtained
5.
Place the specimen for orthoscopic observation
6.
Insert test plates for further observation, test and study
Conoscopic observation
Use 20x to 100x objectives
1.
Engage the polarizer and analyzer for extinction
position
2.
Swing the condenser top lens into the light path
3.
Revolve the Bertrand lens dial (1) to “B” position, to
engae the lens into the light path
4.
Open the aperture iris diaphragm (4) to its largest size
5.
Revolve the focusing dial (5) of the Bertrand lens to
focus on the conoscopic image
Note:
If the periphery of the conoscopic image is dark, move the condenser vertically to find the position where the
periphery is brightest
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