Vertical Illuminator for use with a petrological microscope
Illumination with ordinary or polarized light
The vertical illuminator attached to a Leitz CM model microscope
A total reflecting prism
and a reflecting glass plate are simultaneously mounted
to a bar. The bar, fully inserted into the illuminator
housing, places the total reflecting prism within the
optical path and when the bar is withdrawn to its
extreme stop, the reflecting glass plate is then within the
optical path. The use of either depends upon the nature
of the specimen and the objective employed. This
vertical illuminator is furthermore equipped with a
condensing lens and an iris diaphragm, by means of which
the light rays can be adjusted for proper contrast. A
removable rotatable polarizer fits into the entrance tube of
vertical illuminator. The polarizer can be removed and
replaced with a cap with glass front when ordinary light is used.
The vertical illuminator is attached to a polarizing
microscope in the same manner as an objective using the
three-point objective changing clutch belonging to the microscope.
At the other end of the illuminator is another clutch for
an objective. The set, stored in a wood case with plush lining, includes three
adjustable objective collars and the two centering tools.