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15.2 Rotatable Pol. stage
83 leverfor rotating analyser
84 centring screws
85 lever to swing in polariser
86 screw to secure rotatable stage
87 milled ring to rotate compensator
The rotatable Pol. stage is equipped with a
swing-out polariser.
If required, a first-order red compensator
(sensitive-tint platejand a mechanical stage
can be added to it. The compensator facili-
tates the identification of weakly-birefrin-
gent specimens.
- To fit the compensator, remove the screw
(88)from the underside of the stage.
- Push the compensator in its metal mount
fullyinto the stage.
- Retighten the screw.
- Fit the mechanical stage using the screw
(82).
- Remove the glass stage plate and the stage
clips from the transmitted-light stand.
- Fit the rotatable Pol. stage so that the two
centring screws (84) are symmetrically
positioned in relation to the column.
- Secure the stage with the lever (81).
- Switch on the light.
- Swing in the polariser with the lever (85)
and pull out the compensator slide.
- Look into the binocular tube and move the
lever (83) until the field of view without
specimen is as dark as possible.
- Secure the specimen with the arm of the
mechanical stage and focus on it.
With the help of a crosshair in the eyepiece
(see section 5) and of the two centring
screws, centre the stage as follows:
- The point about which the stage rotates is
adjustable and must be brought into co-
incidence with the axis of the objective, i.e.
with the centre of the crosshair.
- Spin the stage in order to establish the
point of rotation in the field of view.
- Using the screws (84), displace the point
of rotation in the directions ab and cd
(fig. 3). Successively repeat this procedure,
simultaneously rotating the stage, until
the point of rotation coincides with the
centre of the crosshair.
- Push in the compensator mount and ro-
tate it until the field of view appears red.
The rotatable Pol. stage is calibrated and
can be used for angular measurements
(see Instruction booklet M2 275).
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