{ 10 ) 



GREATLY REDUCED PRICESl 



OP 



OBJECT-GLASSES MANUFACTURED BY 



R. & J. BECK, 



68, CORNHILL, LONDON, E.G. 



PRICES OF BEST ACHROMATIC OBJECT-GLASSES. 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



Applicable to all Instetjmekts made with the Uniteesal Screw. 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



3 inches 

 2 inches 

 1 inch . 

 § inch . 

 I inch . 

 ^ inch . 

 i inch . 

 T^r imm. 



Angle 



of 

 aper- 

 ture, 

 about 



Price. 



38 



80 



no 



no 



180 



3 10 

 6 



Magnifting-powek, 



with 6 -inch body and 



eye-j)ieces. 



No. 1. No. 2. No. 3. 



12 

 18 

 46 

 90 

 170 

 250 



350 

 654 



15 

 23 



6r 

 116 

 220 

 330 



450 

 844 



27 



41 



106 



205 



415 



630 



800 



1500 



Bevised Catalogue seat on application to 

 R. & J. BECK, OS, CornliiU. 



