( 10 ) 



aREATLT BEDVCED PRICES 



OF 



OBJECT-GLASSES MANUFACTURED 



68, CORNHILL, LONDON, E.G. 



BY 



PRICES OF BEST ACHROMATIC OBJECT-GLASSES. 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



Applicable to all Instruments made -with the UNrrERSAL Screw. 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



3 inches 

 2 inches 

 1 inch . 

 ^ inch . 

 I inch . 

 i inch . 

 ■t inch . 



Angle 



of 

 aper- 

 ture, 

 about 



18 



38 



80 



no 



no 



180 



Price. 



£ 



1 



1 



1 



1 



1 



2 



3 10 



6 



5 



5 











Magnifting-power, 



with 6-inch body and 



eye-pieces. 



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



46 



90 



170 



250 



350 

 654 



15 



23 



61 



116 



220 



330 



450 



844 



27 



4r 



106 



205 



415 



630 



800 



1500 



Revised Catalogue sent on application to 

 rt. &> J. BECIi, OS, Ooi-nliill. 



