SCIENCE 



NlW SSBIBS 



Vol. xiilll. No. ll()4 



Friday, February 25,1916 f^' c°pik8. ib c™. 



' ' Amntjal Sdbsobiption, 18.08 



CONVERTIBLE BALOPTICON 



For All Known Forms of Optical Projection 



Base instrument projects opaque areas 8 inches square (solid objects of all kinds) and lan- 

 tern slides. Objects of widely var3ang size and shade may be projected without opening the 

 dark chamber doors or refocusing. 

 Instrument as illustrated projects in addition : 



Transparencies held horizontally — ^X-ray plates, brain sections, etc. (projected area, 

 8 inches in diameter). 



Microscopic objects with microscope in vertical position for liquids, and in horizontal 

 position for solid specimen. 

 Apparatus may be added for projecting the spectrum and complementary colors, polarized 

 light, etc. 



All attachments may ba added separately after the instrument is purchased, and the inter- 

 change from one form of projection to another is instantaneous. 



Write for descriptive catalog and special terms 



Bausch ^ Ipmb Optical Q. 



552 ST. PAUL STREET ROCHESTER, N.Y 



San Francisco 



New York 



Washinsrton 

 London 



Chicago 

 Frankfort 



