Schulzo & Bartels, Rathenow. 



95 



focal lengths with relatively large apertures. Exemplified at the Ex- 

 hibition by a set of telescopic objectives of diameters up to 108 mm. 



c) Photographic Objectives. Aplanatic lenses, lenses for detect- 

 ive cameras, cheap photographic objectives for amateur apparatus. 



d) Tele-objectives according to Dr. Miethe for direct photo- 

 graphy of very distant objects. Exemplified at the Exhibition by a 

 specimen having an aperture of 40 mm. (Fig. 1 u. 2.) 



Fig. 2. Photograph taken with Dr. Miethe's tele-ohjective. 



(Showing the part marked in Fig. I taken from the same position.) 



d) Hemispheres for microscopes, polarization apparatus etc. Exem- 

 plified by a set of various sized hemispheres. 



f) Binoculars of a special optical type, for military and marine 

 purposes. Exemplified at the Exhibition by several ^binoculars as sup- 

 plied to the German infantry, artillery and navy. 



