

BAUSCH & LOMB 



BALOPTICON MODEL C 



A high grade Projection Lantern for use in the 

 school, church, home and lecture plat- 

 form. 



Can be equipped with 5 -ampere arc, Nernst, or a 



1 00 candle power incandescent lamp, all of which 



can be connected with any incandescent lamp 



socket. 



Can also be used with Welsbach gas, oxyhydrogen, 



acetylene or alcohol vapor lamps. 



Descriptive Circular 8 D on request 



Our Name on a Photographic Lens, Micro- 

 scope, Field Glass, Laboratory Apparatus, 

 Engineering or any other Scientific In- 

 strument is our Guarantee. 



fiausch & Ipmb Optical <o. 



flEW YORK WASHINGTON CHICAGO SAN FRANCISCO 



London ROCHESTER. NY. rRANKroaT 



SEARCH FAR AND WIDE 

 -AT HO.h E AND JT 

 i, ON THE OTHER SIDE*^ 



COCOA-CHOCOLATES 



WILL ALWAYS BE FOUNDS 

 TO EXCEL (N j 



PURITy-QUALITy-FLAVOR 



SOLD EVERYWHERE 





Refracting and Reflecting 



Astronomical Telescop es 



Standard and Portable 





A? 



Visual and Photographic 



OBJECTIVES 



Computed by our associate 



DR. F. R. riOULTON 



{Chicago University) 





... ^:;v ., 



Illustration shows 5 -in. with pneumatic clock. 





OBSERVATORIES 



Specula, Planes, Eyepieces, etc. 

 Photographs and Circulars on request 



LOHHANN BROS. 



3REENVILLE, OHIO 



U. S. Ac 



