SCIENCE 



New SiauEa 



Vol* XLIII. No. 1121 



Friday, June 23, 1916 



Single Copise, 16 Cts. 

 AinniAL Sdbsobxption, I&OO 



A Mazda Lamp 

 Excelling High 

 Power A.C. Arc 

 for Projection of 

 Opaque 

 Objects 



optical Projection Reduced to its Simplest Terms 



The recently developed, lOOO-watl, gas-filled Mazda lamp used on the new COM- 

 BINED BALOPTICON projects opaque objects with a brilliancy exceeding that of 

 the 35-ampere, alternating current arc lamp. Yet it consumes only 9 amperes. 

 This Balopticon projects opaque objects (projected area, 6x6 inches) and lantern 

 slides, with instant interchange between the two forms. 



The apparatus represents a decided advance in optical projection. The Mazda Lamp 

 is absolutely automatic, and the total cost of operation averages about one- third that 

 for an A.C. arc of equal power. 



Price, $120.00 



Write for Circular 



Bausch ^Ipmb Optical Q. 



552 ST. PAUL STREET ROCHESTER, N.M 



New York Washington Chicago Sa.n Francisco 



Qrand Prize for Balopticons, Panama-Pacific Exposition 



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N 24 191 



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