= 85 = 



No. 177. Axial-image Ocular. With the large Mineralogical Stand HIM 



a BERTRAM) lens forms the objective of an auxiliary microscope for observing 

 axial images. For the same purposes we provide a special auxiliary, the Axial- 

 imagc Ocular, to be used in conjunction with our other stands. 



No. 178. *lris-diaphragm with Ocular. For examining and accurately 

 identifying the axial images of small crystals we supply Iris-diaphragm with 

 Ocular which fits into the tube. 



See special prospectus relating to appliances for investigation with 

 polarised light. 



Nos. 179 to 182. Selenite and Mica Films. We supply regularly four 

 selenite films Red of the I, II., III. and IV. Order; also four different mica 

 films Vs A- V* A. 8 /8 A and 1 / s I. These 8 films compose the set of selenite and 

 mica films originally proposed by H. v. MOHL, No. 179. 



We supply these films in cardboard mounts for laying on Polariser I No. 160 

 or in a metal mount for laying in the slide of Stand III M or for insertion between 

 Analyser and Ocular. 



A Selenite Film for Red of the I. Order generally meets all 

 requirements. 



Axial-image Ocular 



Iris-diaphragm with Ocular, to fit the tube 



MOHI/s Set of Films, mounted in cardboard 



Selenite Films, Red of the I. Order, for Polariser I . 



I. for the slide of 



Stand III M . . 



I. for insertion be- 

 tween Ocular and Analyser 



Marks 



80. 



25. 



15.- 



3. 



Codeivord 



Pendola 



Pendra 



Peueque 



Penetrar 



Penible 

 Peninsula 



Selenite Films of other orders, in cardboard mounts, each 2 Mks., in metal 

 mounts, each 3 Mks. ; Mica Films, in cardboard mounts, each 1.50 Mks., in metal 

 mounts, each 2.50 Mks. 



Regarding other crystal films for similar purposes we must refer to the 

 special prospectus relating to appliances for investigations with polarised light. 



(Bait 



