SCI 



Nzw Series FeIDAY, SEPTEMBER 16, 1921 Sihgle Copies, IS Cm 



Vol. LIV, No. 1394 ' ' Annual Subsceiptioh, $6.0 



Stereoscopic 

 Eyepiece 



A MOST significant addition to our ; 

 for both laboratory and research 

 enthusiastically received by those who h 

 it demonstrated. Presents following ad 



„ «« icopical line, 

 I tf Ts; has been 



PRICE, with Pair of Matched 

 Eyepieces, Eyepiece Diaphragms 

 ana Adapter for FFS Micro- 

 scope $50.00 



1 "^ Iready seen 

 htages : 



1. Makes available the benefits of binocular vision 



at moderate cost ; 



2. Can be adapted to almost any monocular micro<- 



scope; 



3. Gives stereoscopic effect ; 



4. Parallel position of eyepiece tubes, adjustable for 



interpupillary distance, allows full relaxation 

 of ocular muscles, with consequent relief 

 from eye fatigue. 



Allowing the natural use of both eyes, this apparatus 

 will be particularly appreciated by all those who are 

 obliged to do frequent or extended work with the micro- 

 scope. 



Write for illustrated, descriptive circular 



Bausch ^ jpmb Optical ©. 



409 St. Paul Street ROCHESTER, N. Y. 



New York Chicago Washington San Francisco London 



Ltaiing Jl-nettcan Maktrs of Photographic Lenses, Microscopes, Projection Apparatus (BalopUcont) , Ophthalmic 



Lenses and Inslrumenls, Photomlcrographic Apparatus, Range Finders and Gun Sights for Army 



and Naoy, Searchlight Reflectors, Stereo-Prism Binoculars, Magnifiers 



and other high-grade Optical Products. 



