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Schulze & Bartels, Ratbenow. 



Xo. 2788. 



Sckulze & Bartels, Rathenow. 



Sole proprieter: Franz Bartels. 

 Optical Works. 



Established in 1850. 



I. Department: Spectacle Glasses made of glass and pebble. 

 Cylindrical glasses, illuminating lenses, plano-convex and biconvex lenses 

 for all purposes. Spectacle frames, folding spectacles, ophthalmic appli- 

 ances, optometers. 



Fig. 1. Photograph taken with the older type of lens. 



II. Department: a. Telescopes for tourists, military reconnaissance 

 and navigation. Exemplified at the Exhibition 1.) by a conical marine 

 telescope as supplied to the German Navy, with object glass of 62 mm 

 diameter, extremely large field and 2.) by a reconnoitring telescope 

 of 36 mm aperture for the artillery. 



b) Telescope Objectives made in the most exact manner, 

 in particular for measuring-telescopes. Various types according to parti- 

 cular purposes. Optical or chemical chromatic correction. Compensation 

 of spherical aberration in either direction for cathetometers. Very short 



