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3. Operation of Each Part

The P-CS Sénarmont compensator is used by inserting

into the slot of the intermediate tube in place of the

P-CL 1/47. & tint plate

It can be used to measure retardation up to 12. according

to the following procedure.

1 Determination of Extinction Position

Rotate the stage with the specimen under the crossed Nicols to find the direction where the

part of the specimen to be measured appears darkest

2 Determination of Subtraction Position

Rotate the stage 45? from the extinction position to the diagonal position.

Insert the P-CL.

1/47. & tint plate into the optical path and confirm that the interference color of the section

of the specimen to be measured changes toward the lower order side. If the interference

color changes toward the higher order side, rotate the stage another 90°.

3 Measurement

Place the G I F

filter on the field lens and replace the P-CL 1/47. & tint plate with the P-CS

Sénarmont compensator.

Rotate the analyzer so that the section of the specimen to be

measured becomes darkest. When the rotation angle of the analyzer at that time is taken to

(4: wavelength used)

The value of à when using the GIF filter is 546 nm.