( 10 ) 



GREATLY EEDTICED PEICES 



OF 



OBJECT-GLASSES MANUFACTURED BY 



E. & J. BECK, 



68, CORNHILL, LONDON, E.G. 



PRICES OF BEST ACHROMATIC OBJECT-GLASSES. 



No. 



Focal length. 



Angle 



of 

 aper- 

 ture, 

 about 



Price. 



Linear magnifying-power, with lo-inch 

 body-tube and eye-pieces. 



No. 1. No. 2. No. 3. 1 No. 4. No. 5. 



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 . 

 j inch . 

 ^ inch . 

 pr iiich . 

 f inch . 

 i inch . 

 ■i inch . 

 Toimm. 

 -L imm. 

 Jyimm. 

 ^ inch . 



9 



7 



12 

 lO 

 I? 

 23 



25 



32 



45 

 65 

 95 



75 

 120 

 130 

 180 

 180 

 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 



100 



125 

 150 



200 

 250 

 400 

 500 



750 



1000 

 2000 



160 

 200 

 240 

 320 

 400 

 640 

 800 



1200 

 1600 



3200 



30 



45 



67 



90 



210 



300 

 375 

 450 

 600 



750 

 1200 

 1500 

 2250 

 3000 

 6000 



40 

 60 



90 



120 



280 



400 



500 

 600 

 800 

 loco 

 1600 

 2000 

 3000 

 4000 

 8000 



5° 



75 



112 



150 



350 



500 

 625 

 750 

 1000 

 1250 

 2000 

 2500 



3750 

 5000 



lOjOGO 



ECONOMIC ACHROMATIC OBJECT-GLASSES, 



Applicable to all Insteuments made with the Universal Soeew. 



No. 



150 

 151 

 152 

 153 

 154 

 155 

 156 

 157 



Focal length. 



3 inches 

 2 inches 

 1 inch . 

 ^ inch . 

 I inch . 

 A inch . 

 ^ inch . 

 -xVimm. 



Angle 



of 

 aper- 

 ture, 

 about 



38 



80 



no 



no 



180 



Price. 



3 10 

 6 



Bevised Catalogue sent on application to 

 H. Sc .T. BECIi, OS, Cornhill. 



