OF OPTICAL INSTKUMENTS. 127 



('upturns' and Pilots' Binocular Glasses. These glasses, from their perfect definition, 

 as well as convenience in use, have not only superseded the old inverting night 

 glass, but are now regarded as indispensable for look-out glasses, both in the 

 navy and merchant service. 



1503. CAPTAINS' AND PILOTS' GLASSES, bronzed and covered with black leather, object 



glass 2 in. diameter ...... 4 4 



These glasses from the large field of view and moderate cost, are recommended with much 

 confidence, as great favourites in the service. 



1504. CAPTAINS' AND PILOTS' GLASSES OF FINEST QUALITY, with twelve glasses, and 



increased power ; same color as the above, object glass 2^ in. diameter 6 15 



Binocular or Field Glasses, superior, with eight glasses and increased power, 

 though of smaller field in proportion to the object glass ; japanned and black 

 leather mounting, with sling case and strap, 



1505. Object glass l T 5 o diameter 1 17 61 1507. Object glass 2 in. diameter 250 



1506. 1 T V 2 2 | 1508. 2 2 15 



Binocular, Field, and Opera Glasses (black morocco), with three revolving eye-pieces 

 to increase or diminish the powers, and adapt them at pleasure, for the opera, 

 the country, or the seaside ; both long and short vision are fully met in 

 this excellent arrangement, whilst even in the theatre this combination of 

 powers is found of great convenience. In collapsing sling case, 



1509. Object glass 1-^ diameter 3 6 1512. Object glass 2 in. diameter 3 18 



1510. L 3 12 



1513. 2 440 



If with spray or sun-shade, 12s. each extra. 

 THREE CHANGE OPERA GLASSES as above, ALUMINIUM, in collapsing sling cases, 



1514. Object glass L& diameter 6001 1516. Object glass 2 in. diameter 6 15 



1515. 1 T V 6 6 | 1517. 21 7 15 



MARINE, PILOT, OR FIELD GLASSES, three change, covered with black morocco, in 

 aluminium, of extra light weight as above, with sun or spring-shades extra, 

 also very convenient for tourists, 



1518. Obj ect glass 1 T % diameter 6 18 I 1520. Object glass 2 in. diameter 7 15 



1519. 1^ 7 7 | 1522. 2 880 



1523. Object glass 2J in. diameter . . 900 



Single Military Field Glasses, three change, as No. 1509, with sling cords or straps 

 and sun or spray shades. 



1524. Object glass 1^ diameter 1 6 01 1526 Object glass 2 1- diameter 1 12 6 



1525. l T 9 o 1 10 I 1527. 2^ 1 16 



Distance telescopes as used by the Prussian military staff, see Telescopes, No. 1376. 



STEKEOSCOPES. 



These admirable instruments are now well known and valued, alike for their 

 scientific worth and the means they afford for viewing objects and scenes from all parts 

 of the world, with an interest only next to seeing the real object, or being on the 

 spot; thus, in union with photography, Palestine, Syria, China and Japan, hitherto 

 known as it were but in name, may now be regarded as almost brought to our dwellings, 

 whilst the daily increasing demand and supply seems to bid fair for their becoming 

 almost as noble a means of instruction as printing itself. 



