72 



turned back on their hinges so as to enable the object being viewed direct 

 instead of through the prism. The ABBE cube and other parts always return to 

 exactly the same position on being closed down again. 



Fig. 34. Small ABBE Drawing Apparatus, No. 110. ("/., Full Size.) 

 Tl 



Fig. 35. Large ABBE Drawing Apparatus, No. 111. ( 3 / r , Full Size.) 



No. 111. *Large ABBE Drawing Apparatus. After removing the 

 ocular the clamping ring of the drawing apparatus is slipped over the tube and 



No. 

 Ill 



Large ABBE Drawing Apparatus, in case 



Marks Codeword 

 60. Patiido 



