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26
Any oil remaining on an oil-immersion type of objective or staining on the tip of a dry type of
objective has a negative effect on viewing. After using oil. wipe all of it away and make sure that
there is no oil on the tips of the other objectives.
Use petroleum benzine
to
wipe away immersion oil. Removing the oil and wiping with absolute
alcohol (ethyl alcohol or methyl alcohol) will complete cleaning.
If
you cannot obtain petroleum benzine, use methyl alcohol. Note that methyl alcohol does not
clean as well as petroleum benzine and it will be necessary to repeatedly wipe the surfaces (three
or four times is usually sufficient to clean the lenses.)
&WARNING When using petroleum benzine or absolute alcohol. always follow the
instructions provided by the manufacturer. Keep these flammable liquids away
from fire or sparks.
II!]
Orientation of polarizing plates (Polarizer and Analyzer)
; •
Diascopic Observation
The dia-polarizer and analyzer coincide with the directions of the orientation plate on the top of
the microscope base when the protractor scale is at
''O''
(the polarizer is in the X direction: P and
the analyzer is in the Y direction: A), and are in the crossed Nicols position. The dark cross image
as shown in the diagram can be observed at this time in the conoscopic observation.
It should be noted that the X direction is explained as that of the analyzer and Y direction
as that of the polarizer in some commercially available technical manuals and reference
books.
Polarizer
scale: O
The dia-polarizer is attached to the bottom of the
substage and can be rotated 360°. It can be removed
from the bottom of the substage by pulling down as
necessary. When re-attaching. align the positioning
pin on the top of the polarizer with the groove in the
bottom of the substage. Since the groove in the
bottom of the substage is not visible when the
condenser is attached to the substage, attach the
polarizer after temporarily removing the condenser.
Analyzer
Dark
scale: O
cross image
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