50-100
B & L, 1912, prism binoculars: 3 x 12 $40; 6 x 21 $40; 6 x 30 $60; 8 x 21 $40; 8 x 25 $50; 12 x 30 $70; 10 x 45 $75. Ross, 1901, prism binoculars: 8x 8 pounds; 12x 10 pounds. Binocular telescopes (lens erecting system): 5 x 1/2 inch 4 to 7 pounds; 24 x 1 5/8 inch 8 to 13 pounds. Galilean field glasses: 2 to 9 pounds. ................
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