CARL ZEISS’ 
Microscopes and accessories. 
Microscopic Objectives, both Achromatic and Apochro- 
matte, 
Microphotographic Apparatus, for visible and ultra- 
violet light. 
Arrangement for viewing Ultra-Microscopic -Particles. 
Projecting Lanterns, the Episcope and Epidiascope. 
Binocular and Monocular Telescopes. 
Astronomical and Astrophotographic Objectibes. 
Field Glasses and Stereoscopic Telescopes. 
Stereoscopic Range Finders. 
Photographic Lenses (Protar, Planar, Unar, and Tessar); 
Reversing Prisms, Focusing Lenses, etc. 
Palmos Gameras with focal plane shitters. 
Stereoscopes and Verants for viewing photographs. 
Telescopic Gun Sights. 
Optical Measuring Instruments {or Chemists and Phys 
icists, including Spectroscopes, Spectrometers, Re- 
fractometers, Comparators, Stereo- Comparators, 
Interference and Schlieren Apparatus, etc. 
Catalogues and circulars describing any of the above instruments, together with 
quotations of prices, either duty paid or duty free, sent on request. 
T'HE SCIENTIFIC SHOP 
ALBERT B. PORTER 
Scientific Instraments 326 Dearborn St., Chicago 
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