( 10 ) 



eHEATLT REDTTCED FSICES 



OF 



OBJECT-GLASSES MANUFACTURED BY 



R- & J. BECK, 



68, CORNHILL, LONDON, E.G. 



PRICES OF BEST ACHEOMATIC OBJECT-GLASSES. 



No. 



Focal length. 



Angle 



of 

 aper- 

 ture, 

 about 



Price. 



Linear magnifying-power, with lo-inch 

 body-tube and eye^pieces. 



100 

 101 

 102 

 103 

 104 

 105 

 106 

 107 

 108 

 109 

 110 

 111 

 112 

 113 

 114 

 115 

 116 

 117 



4 inches 

 3 inches 

 3 inches 

 2 inches 

 2 inches 

 1| inch . 

 I inch . 

 f inch . 

 I inch . 

 -TO iiich . 

 To iiich . 

 I inch . 

 i inch . 

 i inch , 

 -jij inam. 

 yL imm. 

 ^ imm. 

 -i, inch , 



9 



7 

 12 

 10 

 17 

 23 

 25 

 32 



45 

 65 



95 



75 

 120 

 130 

 180 



160 



£ s. 

 1 10 



1 10 



2 10 



1 10 



2 10 

 2 10 

 2 

 2 10 



2 10 



4 



5 



3 10 



4 10 



5 



5 



8 



10 



20 



50 



75 



112 



150 



350 



500 

 625 

 750 



lOCO 



1250 

 2000 

 2500 



3750 



5000 

 10,000 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



Applicable to all Instbumekts made with the Univeesal Scretp 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



3 inches 

 2 inches 

 1 inch . 

 J inch . 

 J inch . 

 i inch . 

 •t inch . 



Angle 



of 

 aper- 

 ture, 

 about 



18 



38 



80 



no 



no 



180 



Price. 











5 



5 



5 



5 



3 10 

 6 



Magnifying-powee, 



with 6-inch body and 



eye-pieces. 



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



12 



18 



46 



90 



170 



250 



350 

 654 



15 

 23 

 61 

 116 

 220 

 330 

 450 

 «44 



27 



41 



106 



205 



415 



630 



800 



1500 



Bevised Catalogue sent on application to 

 K. & J, BECK, OS, Cornhill. 



