Olympus POS Buku Petunjuk - Halaman 12

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OPTIONAL ACCESSORLES

Cross Movement Stage

The cross movement stage is attached to the main rotatable stage. After the slide glass has been

properly set, the observation point is moved lengthwise and widthwise until it coincides with the

rotational center of the main stage. The cross movement range is 30mm, and the minimum

vernier reading is 0.1 mm.

lateral movement handle

fitting screw

Back and forth

—

movement handle

vernier scale

Back and forth

movement scale

— vernier scale

lateral movement scale

stage clip

Berek Compensator

The Berek compensator contains laminated calciete in order to examine double refraction.

Retardation is determined by checking the dial rotation angle against the correction table. First

of all, the specimen is blotted out of vision by bringing the stage to a crossed Nicols position.

The stage is rotated until the angle indicator dial registeres 45°; then the stage is clamped.

Next, the test plate is inserted. The dial is turned until the zero interference color appears.

Finally, the dial reading is checked against the correction table. If the order does not decrease,

the entire process is repeated after rotating the specimen 90°. The test plate should be inserted

or removed when the angle indicator dial registers 30° since at this angle the test plate is at right

angles to the optical axis; in other words, retardation is zero. If the angle is overly sharp, the

plate will come in contact with the insertion slit.

Angle indicator dial