SCIENCE 



Nxw Serik 



Vol. XXXVIII. No. 978 



Friday, September 26, 1913 



Single Copim, 15 Cts. 

 Anndal Sdbsobiption, 85.00 



Easy and Rapid Adjustment 

 To Any Form of Projection 



Meets every possible demand of science teachers for a projection instrument that may 

 be changed rapidly and easily from any one form of projection instrument to another. 

 Combines the highest efficiency, economy in operation and durability in construction. 



^auscK |omb 



j^alopticon 



herewith illustrated, projects interchangeable lan- 

 tern slides, opaque objects in a horizontal plane, 

 microscopic objects, physical experiments and 

 polarized light — meeting every projection need. 



Can be bought in simpler form and built up as 

 desired. 



Projects opaque areas up to 8 in. square with 

 brilliant illumination by direct lighting of object 

 and shows image in correct position on screen. 



Accommodates objects of widely varying size and 

 thickness. 



Descriptive Circular sent on request. 



Bausch ^]pmh OP^cal (o. 



552 ST. PAUL STREET ROCHESTER, N.Y. 



New York 



Washington 



San Francisco 



