Niw Series 



Vol. XXXVIII. No.! 



Friday, July 25, 1913 



Single Copies, 15 Ctb. 

 Annual Subsokiption, $5.00 



NEW CONVERTIBLE 

 Bausch&Lomb Balopticon 



In its Simplest Form Provides for 

 Lantern Slide and Opaque Projection 



Can be easily built up, as illustrated 

 for all other forms — microscopic, 

 vertical and polariscopic — with 

 quick and convenient interchange 

 from one to another. 



Opaque objects of widely varying 



size and shape can be placed in hori- 

 zontal position and surfaces 8-inch 

 square projected brilliantly — Lamp 

 house tilts (see dotted lines in illus- 

 tration) to throw light directly on 

 object, giving maximum illumination 

 for single lamp. 



Write for literature or further information 



Bausch ^Ipmb Optical (o. 



552 ST. PAUL STREET ROCHESTER, N.Y 



New York 



Washington 



Chicago 



San Francisco 



