OF OPTICAL INSTKUMENTS. 



125 



BINOCULAR, OPERA, FIELD, OR PILOT GLASSES. 



The great convenience of binocular glasses in the opera and picture gallery, as 

 well as for out-door use and at sea, is well known; they should however as far as 

 possible be especially adapted for each of these purposes ; thus, as a rule, large glasses 

 are most suitable for use at sea, whilst portability, with reduced size and weight, 

 expanded range, and clear sharp definition, are for the opera and field. 

 Single Achromatic Opera Glasses in flexible cases. 



1453. SMALL SIZE PEESPECTIVE GLASS, for waistcoat pocket, covered with black or dark 



fancy morocco, 1-inch object glass. An excellent companion for the picture 



gallery or lecture hall . . . . . 076 



1454. PEESPECTIVE GLASS, ditto, ditto, ivory and gilt . . 12 6 



1455. PEESPECTIVE GLASS, ivory and gilt, 11 object glass . . 16 6 



1456. PEESPECTIVE GLASS, with fancy morocco . . . 10 6 



If with six glasses and higher power 5s. and 7s. 6d. each extra. 



Binocular Achromatic Opera Masses, in flexible cases, covered with black or dark 

 fancy morocco. 



1457. Object glass 1^ diameter 15 



1458. 1-V 18 



1459. Object glass 1 T 7 Q diameter 1 



1460. 2 in. 1 



Well suited for the opera and picture gallery. 

 BINOCULAE OPEEA GLASSES, covered, etc., as above, finest quality, with twelve glasses. 



1462. Object glass 1 T V diameter 1 10 1464. Object glass l T 7 o diameter 1 18 



1463. 1 T % 1 13 1465. 2 in. 220 



The following binocular opera glasses, of the finest quality, with carefully connected 

 triple achromatic object glasses and eye-pieces in the various fancy mountings described, 

 in handsome velvet cases, will be found admirable as presents, their quality and 

 beautiful appearance being unsurpassed. 



IVOEY AND BEST GILT, WITH TWELVE GLASSES (fig. 1469), p. 126, 



1466. Object glass L& diameter 1 18 01 1468. Object glass l T 7 o diameter 2 12 



1467. l T 3 o 24 I 1469. 2 in. 300 



SHELL AND BEST GILT, WITH TWELVE GLASSES, 



1470. Object glass 1^ diameter 2001 1473. Object glass 1 T V diameter 2 10 

 1472. l T 3 o 24 I 1474. 2 in. 330 



OEMOLU WITH TWELVE GLASSES, with rich ornamental bodies engraved ; colored, and 



best gilt, very chaste, and beautiful, 

 1475. Object glass 1 T V diameter 2 18 



1476. 



L TTJ 



360 



1477. Object glass l T 7 o diameter 3 17 



1478. 



2 in. 



4 10 



