Bausch & Lomb 

 New Portable Balopticon Model C 



has been designed with a view to furnishing a lantern of the 

 highest grade at a very moderate cost, for class room work. 



The facility with which a subject may be presented to a 

 class is only one of the advantages of this modern class room 

 equipment. 



Owing to all its parts being standardized, it permits the ad- 

 dition at any later time of attachments for microscopical and 

 opaque projection, the latter showing enlarged images of ob- 

 jects in their natural form and color. 



Send for new Catalog D-g, giving complete description 

 and prices with various accessories. Correspondence invited. 



Our Name on a Photographic Lens, Micro- 

 scope, Field Glass, Laboratory Apparatus, 

 Engineering or any other Scientific In* 

 strument is our Guarantee. 



Bausch & lomb Optical (o. 



fitW YORK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON ROCHESTER.. NY. FRANKFORT* 



Cocoa sold 

 by dealers 



everywhere in 25c, 15c 



and 10c cans. 



Refracting and Reflecting 



Astronomical Telescopes 



Standard and Portable 



Visual and Photographic 



OBJECTIVES 



Computed by our associate 



DR. F. R. HOULTON 



{Chicago University) 



OBSERVATORIES 



Specula, Planes, Eyepieces, etc. 



Photographs and Circulars on request 



LOHflANN BROS. 



Illustration shows 5-in. with pneumatic clock. 



GREENVILLE, OHIO 



U. S. A. 



