Carl Zeiss, Jena. 



No. 2801. 



Carl Zeiss, Jena. 



Optical Works. 



A. Microscopes and Microscopical Accessories. 



Complete Series of apochromatic objectives and compensating 



eye -pieces. , 



i Complete Series of achromatic objectives and Huyghenian 



eye -pieces. 



Accessory apparatus for testing objectives. 

 Complete Series of Microscope Stands. 

 Apparatus for projection and photo -micrography. 

 Microscopes for crystallographic and petrological research. 

 Illuminating apparatus for white and for coloured light. 

 Spectroscopic eye -pieces. 



Apparatus for measuring and counting microscopical objects. 

 Dissecting microscopes and magnifiers. 



All as described in the Catalogue of Microscopes and 

 Microscopical Accessories. (Catalogue No. 29, 1892, German, English 

 and French editions.) 



B. Photographic Lenses, Zeiss Patent Anastigmats, Six Series. 



Series I, 1 



4,5, equivalent focus 130 354 mm (5 14 in.) 



Series 11,1 6,3, 85-590 (3,3-23,6 ) 



Series III, 1 7,2, 96-586 (3,8-23,1 ) 



Series IVa, 1 9, 120820 (4,8-65 ) 



Series IV, 1 12,5, 62906 (2,5-35,7 ) 



Series V, 1 18, 86-946 (3,437,3 ) 



All as described in the Catalogue of Photographic Lenses, 



1891, and Supplement, 1892. (German, English and French editions.) 



C. Optical Measuring Instruments for scientific and 

 technical purposes. 



Abbe's Spectrometer and accessory apparatus. 



Abbe's Large Refractometer. 



Percentage Refractometer. 



Refractometer for determining the percentage of salt in 



sea-water. 

 Refractometer for special technical purposes (Butyro- 



refractometer). 

 Cry stal-refractometers . 

 Contact-Micrometer. 

 Small Comparator. 



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