SCIENCE 



Niw SiatrBS 



Vol. XXXIX. No. 995 



Friday, January 23, 1914 



SiNGLB COPIKS, 15 CtS. 



Anntial Subsobiption, J5.00 



BAUSCH & LOMB 



UNIVERSAL BALOPTICON 



(NEW MODEL) 



An ideal lantern for general classroom and laboratory work — projects lantern slides, opaque objects 

 and illustrations and transparent objects held horizontally. Some of its features: 



1 . Simple, durable construction and standiirdization of parts. 



2. Direct lighting of opaque object, covering area 6-in. square and giving brilliant illumi- 

 nation. 



3. Correct Position, from left to right, of all images on the screen. 



4. Adjustable horizontal object holder. 



5. Possibilities of building up for microscopical or moving picture projection. 



6. Quick'and convenient interchange between all forms of projection. 



Price, as illustrated, $160.00. Special terms to educational institutions. Send for circular. 



BAUSCH & LOMB OPTICAL CO. 



552 St. Paul St. ROCHESTER, N. Y. 



NEW YORK: 200 Fifth Ave. SAN FRANCISCO, 154 Sutter St. 



WASHINGTON: 613 Fifteenth St., N. W. FRANKFURT A.M.: G.m.b.H. 31 Schillerstrasse 



CHICAGO: 122 S. Michigan Blvd. LONDON: 37 and 38 Hatton Garden, E.G. 



