BALOPTICON MODEL C 



THE wider use of Projection Apparatus in school work 

 makes its selection a matter of first importance. 



Sjj To meet the demand, we offer our Lantern C which is 

 ideal for this work. It is a simplified form of our larger, more 

 elaborate and hence more expensive apparatus, and it is fully 

 equal to all the requirements of high school work. 



(j Lantern C, complete with Electric Lamp, $50.00 ; 

 with Acetylene Burner, $45.00. 



^j PRISM is a little magazine of lens information. 



Send for copy. 



€jj Oar name on a Laboratory Apparatus, Photographic Lens, 

 Field Glass, Microscope, Scientific or Engineering Instru- 

 ment is our Guarantee. 



Bausch & Lomb Optical Co 



Carl Zeiss, Jena 

 Offices. 

 New York 

 Boston 

 Chicago 



George N. Saegmuller 

 San Francisco 

 Washington 

 London 

 Frankfort 



ROCHESTER. N. Y. 



If you want 

 the Best 



CoCOS and 



Chocolate 



in the World 

 insist on getting* 



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. 



Illustration shows 5-in. with pneumatic clock. 



Photographs and Circulars on request 



LOIiriANN BROS. 



GREENVILLE, OHIO : : : : U. S. A. 



