( 10 ) 



GEEATLY REDUCED PRICES 



OF 



OBJECT-GLASSES MANUFACTURED BY 



R. & Je BECK, 



68, CORNHILL, LONDON, E.G. 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



APPLlCABIiE TO ALL INSTEUMENTS MADE WITH THE UNIVERSAL SoREW. 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



3 inches 

 2 inches 

 1 inch . 

 ^ inch . 

 I inch . 

 i inch . 

 i inch . 

 -rV imm. 



Angle 



of 

 aper- 

 ture, 

 about 



Price. 



38 



80 



no 



no 



180 











5 



5 



5 



5 



3 10 

 6 



Eevised Catalogue sent on application to 



