34 



For those of our stands which are not equipped with the ABBE illuminating 

 apparatus we supply the following condensers and diaphragms which are specially 

 adapted for their various purposes, viz: 



a. For Stand IV b . 



1. *Simplified Illuminating Apparatus, No. 37. Is a condenser system 



of 1,20 numerical aperture, in a sliding sleeve with centrally fixed iris-diaphragm. 

 This apparatus gives adjustable central illumination of any degree, but not 

 oblique light. It slips into the sleeve, fixed below the stage, by means of a 

 bayonet joint. 



Price: Marks 30. . Code-word: Parafuego. 



2. *Simplified Illuminating Apparatus, No. 38, with swing-out con- 

 denser as well as a centrally fixed iris-diaphragm. 



Price: Marks 55. . Code-word: Paragnas. 



In addition to the condensers with centrally fixed iris - diaphragm , specified above 

 under 1 and 2, the cylinder-diaphragm, No. 21, and the iris-cylinder diaphragm, No. 22, 

 as used with the ABBE illuminating apparatus, may also be used on Stand IV b . But the 

 achromatic condensers, the centring apparatus for objectives, the diaphragms for dark-ground 

 illumination, the polarisers and the illuminating apparatus for spectroscopically decomposed 

 light are absolutely inapplicable to Stand IV b . 



b. For Stands VI and VII. 



For these stands a sliding sleeve, similar to that of Stand IV b , but with a 

 diameter of 20 mm only, is fitted underneath the stage. 



We supply the following accessories made to fit into this particular sleeve: 



1. The Cylinder-Diaphragm fitted with 3 stops, No. 39. 



Price: Marks 2. . Code-word: Paralaje. 



2. The Iris-cylinder Diaphragm, No. 40. Fig. 13. 



Price: Marks 8. . Code-word: Paralelo. 



Fig. 13. 



Plan view. 



Side elevation and 

 sectional view. 



Iris-cylinder diaphragm, No. 40. 



(Full Size.) 



In subsequent orders for the iris-cylinder diaphragm, No. 40, 

 tlte factory number of the stand with which it is to be used should 

 be stated. 



