SCIENCE 



MIW BSBIS8 



Tot. XXXVI. No. 826 



Friday, September 27, 1912 



8IHSLI Conn, IB Cn. 

 ASHDXI. ST;BiC>imOR,|S.( 



Discriminating Teachers Value this Instrument 



Discriminating teachers of science value this projection instrument especially 

 because they can change rapidh) and easily from any one form of projection to 

 any other. It is most efficient, durable and economical. The 



BauscK^lomb 



lausci 



Convertible 



j^alopticon 



as here illustrated, projects interchangeably lantern slides, opaque illustrations 

 and objects, in Vertical and horizontal plane as may be desired—mrcroscopfc ob- 

 jects, polarized light and physical experiments. Every known form of projection 

 is possible. The lantern may be bought in simpler form and built up as desired. 

 . .. The dark chamber and>bject holder are so constructed that large objects of varying thicknesres 



Jhe >"P'"°r quality ^^^ ^ ^ conveniently put in place and automatically brought mto conect position. 



of ^nausct\ Q^rnb ten- _. , . . t « ^w.. . .. 



ses. microscopes, field Descnpt.vo circular 15D sent^on request. 



stSBSRausch ^ Ipmb Optical Q, 



sttumenls is the product \ „.„^«.. 



o/near/u SiVth, VeaM WEW YORK WASHINGTON CHICAGO SAN FRANCISCO 



of Experience. "-O ^ D O N J^OCH ESTEIi , N .Y. fRANKFORT 



