SCIE 



(■ OCT 19 1920 



New Series 

 Vol. LII, No. 1346 



Friday, October 15, 1920 



Single Copies, 15 Cts. 

 Annual Subsckiption, 86.00 



It's Lastin 

 That Count 



ressions 



PVERY educator knows this — and it is the appreciation of v {^ . chat has 



led thousands of schools, colleges and societies the countr^ over to adopt 

 picture projection apparatus as one of the simplest and surest aids to efficient 

 instruction. 



It is significant that an increasing proportion of the purchasers of projec- 

 tion outfits are selecting the 



BAUSCH 8C LOMB BALOPTICON 



The Perfect Stereopticon 



The Balopticon is invaluable for classroom, laboratory and auditorium. 

 Models are made for showing either lantern slides or opaque objects, or both — 

 photo prints, postcards, specimens, etc. 



The Balopticon "speeds up" impressions and makes them ever- 

 lasting. The name of the maker assures the quality and length 

 of the Balopticon's service. 



gaiisch ^ Ipmb Optical ©• 



522 ST. PAUL STREET 



ROCHESTER, N. Y. 



Leading American Makers of Photographic Lenses, Microscopes, Projection Apparatus 

 {Balopticons), Ophthalmic Lenses arid Instruments, Pholomicrographic Apparatus, Range 

 Finders and Gun Sights for Army and Navy, Searchlight Reflectors, Stereo-Prism 

 Binoculars, Magnifiers and other High-Grads Optical Products. 



thatches may see 



~~>-_ hetter an^ farther -^-^ 



