( 10 ) 



GREATLY REDUCED PRICES 



OF 



OBJECT-GLASSES MANUFACTURED BY 



R. & J. BECK, 



68, CORNHILL, LONDON, E.G. 



No. 



100 

 101 

 102 

 103 

 104 

 105 

 106 

 107 

 108 

 109 

 110 

 111 

 112 

 113 

 114 

 115 

 116 

 117 



PRICES OF BEST ACHROMATIC OBJECT-GLASSES. 



Focal length. 



4 inclies 

 3 inches 

 3 inches 

 2 inches 

 2 inches 

 IJ inch . 

 I inch . 

 i inch . 

 I inch . 

 To ™ch . 

 j% inch . 

 f inch . 

 i inch . 

 i inch . 



T5 imm. 

 Jgimm. 

 ■Jyr inch . 



Angle 



of 

 aper- 

 ture, 

 about 



Price. 



9 



7 



12 

 lO 

 17 



23 

 25 

 32 



45 

 65 



95 



75 

 120 

 130 

 180 

 180 

 180 

 160 



Linear magnifying-power, with lo-inch 

 body-tube and eye-pieces. 



No. 1. No. 2. No. 3. 1 No. 4. 1 No. 6. 



£ s. 

 1 10 



1 10 



2 10 



1 10 



2 10 

 2 10 

 2 

 2 10 



2 10 



4 



5 



3 10 



4 10 



6 



5 



8 



10 



20 



30 



45 



67 

 90 



210 



300 

 375 

 450 

 5oo 



750 

 1200 

 1500 

 2250 

 3000 

 6000 



40 

 60 



90 



120 



280 



400 



500 



600 



800 



1000 



1600 



2000 



3000 



4000 



8000 



50 



75 



112 



150 



350 



500 

 625 



750 

 1000 

 1250 

 2000 

 2500 



3750 



5000 



10,000 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



Applicable to all Instbtjments made with the Universal Screw. 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



Angle 



of 

 aper- 

 ture, 

 about 



18 



38 



80 



no 



no 



180 



Price. 



s, 











5 



5 



5 



5 



3 10 

 6 



Bevised Catalogue sent on application to 

 It. Sc .T. BECK, OS, CornJiill. 



