34 



b. For Stand VK 



Similarly as in Stand V there is provided a sliding sleeve below the stag< 

 in Stand VI a , which, however, has only a diameter of 20 cm. Suitably adaptec 

 for this sliding sleeve we supply: 



No. 39. Cylinder Diaphragm with three stops. 

 No. 40. *lris-cylinder Diaphragm. 



No. 41. Illuminating System, double lens formation num. A p. 1.0. foca 

 length about 7 mm, with centrally fitted iris-diaphragm. 



In subsequent orders for No. 40 or 41 the cylinder-diaphragn 

 belonging to the Stand should be forwarded. 



II. Illumination by incident light. 



In the examination of opaque objects, metal specimens, etc., ar 

 appliance for adequately lighting up the specimens from above is indispensable 

 If the free working distance of the objective used be very large, it general!} 

 answers sufficiently well to illuminate the object by the direct rays of daylight 01 

 lamplight, but, if necessary, the condition of the light may be improved by mean; 

 of a collective lens placed before the microscope (see under heading of Accessory 

 Apparatus, p. 91). When, however, the available working distance is small, ar 

 appliance for passing the light through the objective becomes necessarv. Thi; 

 requirement is met by the Vertical Illuminator, constructed now by us for ; 

 considerable time past. 



No. 42. *Vertical Illuminator, Fig. 13. The rays issuing from the soura 

 of light enter through a lateral opening in the mount of the apparatus, strike tin 



Cylinder Diaphragm with three stops 



Iris-cylinder Diaphragm . 



Illuminating system, double lens formation, num. Ap. 1.0, 



with iris-diaphragm .- 



Vertical Illuminator . 



Marks < Codeword 



2. Paralajc 

 8. Paralclo 



Paralizar 

 18. Parainrntu 



