Bauhaus-Universität Weimar

Microscopes and Accessories for the Microscope, Carl Zeiss, Jena, 35th Edition
Zeiss, Carl
tube-length of 190 mm. When setting the draw-tube, the depth of the Vertical 
Illuminator should be deducted from this length, assuming the illuminator to be 
attached to the tube without any intermediate adapter. 
Objects mounted under a cover-glass cannot be viewed through the Vertical 
Illuminator with dry lenses owing to the reflection of light which occurs at the 
cover-glass and in this case it will be necessary to use an oil-immersion lens to obviate 
the ocurrence of reflection. As a general rule objects so viewed should be uncovered, 
which again necessitates all objective of higher powers from the Apochromatic 8-mm 
Objective and the Achromatic D Objective upwards being specially mounted for the 
absence of a cover-glass. Objectives so adjusted cannot, of course, be used for 
examining objects mounted under a cover-glass in the usual way. It is always advis¬ 
able to cut down the pencil of light which proceeds from the lamp until it just covers 
that portion of the object which can be seen through the objective. This can readily 
be accomplished by illuminating the object with the aid of a bull’s eye lens fitted 
with an iris-diaphragm. Suitable incandescent gas lamps and electric glow lamps 
are Items Nos. 13.9200 and 13.9210 listed on page 110. 
Full particulars respecting the management of the Vertical Illuminator are 
given in the Directions, Mikro 89. 
No. 12.0410. NACHET’s Vertical Illuminator with Iris Diaphragm. 
In its general arrangement this illuminator re¬ 
sembles No. 12.0400, from which it differs only in 
that the window at the side is fitted with a small 
iris-diaphragm. This serves like the iris-diaphragm 
of the ABBE illuminating apparatus to limit the aper¬ 
ture of the illuminating pencil. 
No. 12.0450. BECK’s Vertical Illuminator 
with Iris Diaphragm (Fig. 16). 
This Vertical Illuminator has the reflecting prism 
replaced by a plane glass inclined at an angle of 
45° to the axis of the microscope. This arrangement 
has the advantage that it leaves the entire aperture 
of the objective free for observation, in consequence 
of which it is preferable for observations under a 
high magnification in that it does not interfere with 
the resolving power of the objectives. 
For use with the Binocular Microscopes we 
provide a special illuminating arrangement, which 
will be described as part of these microscopes (p. 73). 
No. ! Marks Codeword 
12.4010 NACHET’s Vertical Illuminator with Iris-dia- 
phragm, in case...........38.— Nicantor 
12.4050 BECK’s Vertical Illuminator with Iris-diaphragm, 
in case...............38.— Micare 
Fig. 16. 
Vertical Illuminator with Iris 
Diaphragm and Plane Glass 
(Full Size.)


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