B 40 - 017 e / 12.96
5 Modules
5.1 Universal rotary stage
5.1.1 Sample
The sample is inserted between glass segments
(Fig. 1/
6
and
7
) and connected with them by the
immersion fluid. The sample surface must be in the
center of the sphere. The thickness of the object
carrier should therefore be 0.9 to 1.1 mm, that of
the cover glass 0.16 to 0.18 mm, and that of the
sample 0.03 mm. If the thickness of the object
carrier and the object differs, the segments and
the sample can be vertically adjusted.
5.1.2 Schmidt ruler
The Schmidt ruler (Fig. 1/
11
) is used for structural
analyses. The short leg (Fig. 3/
2
) is inserted in one
of the trapezoidal guideways. The position of the
sample can be secured using the stage clamps
(Fig. 1/
10
) which must be screwed into the
threaded bores (Fig. 3/
20
).
5.1.3 Segments
The segments are supplied in pairs. Each pair con-
sists of an upper segment (Fig. 1/
6
) with a radius of
6.24 mm and a lower segment (Fig. 1/
7
) with a
radius of 14.01 mm.
The stage is equipped with three segment groups
featuring different refractive indices. Segments
with the refractive index n
D
= 1.516 can be used,
for example, to measure the cleavage direction in
fluorite.
Segments with the refractive index n
D
= 1.556 are
suitable for examining quartz and feldspa crystals.
Segments with the refractive index n
D
= 1.648 are
intended for the measurement of higher-refracting
minerals such as pyroxenes and amphiboles, for
example. In this case, a higher-refracting contact
fluid is also recommended such as -
bromonaphthalene, for example.
5.2 Objectives
Examinations using the universal rotary stage can
only be performed with the newly computed
Achromat objectives which are screwed into the
objective nosepiece direct, without any adapter.
The engraved magnification and aperture figures
apply when used in conjunction with the segment
pair n
D
= 1.556.
If the objective is combined with a segment pair
featuring another refractive index, the magnifica-
tion figure and the numerical aperture change by
the factor K:
K =
x
1,556
with x being the refractive index 1.516 or 1.648
(depending on the segment pair used).
In orthoscopic observation, the contrast is in-
creased by closing the iris diaphragm with which
all objectives are equipped. The condenser stop
should be narrowed down simultaneously..
Use the Achromat 50x/0.60 objective for cono-
scopic observations, opening the iris diaphragm of
the objective and the aperture stop of the con-
denser.
Achromat objectives with segment n
D
= 1.556:
Magnification /
Aperture
Working distance
in mm
Cat.No
with
segment
without
segment
with
seg-
ment to
seg-
ment
surface
without
segment
to sam-
ple sur-
face
5x/0.13 3.2x/0.08 2.8 9.0 442001
5x/0.30 12.8x/0.1
9
4.4 10.6 442003
50x/0.60 32x/0.38 2.3 8.5 442005
Table 3
(330 strony)
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