OF OPTICAL INSTKUMENTS. 



101 



FIG. 1098. 



FIG. 1097. 



FIG. 1100. 



FIG. 1106. 



1089*. Spectacle Triers, containing eight pairs, from middle age to oldest sights, 

 in neat horn mounting . . . . . 150 



1090. SPECTACLE TEIEES, for near or short vision, consisting of seven pairs of 

 concave glasses of graduated sights, with the focus marked on each from No. 1 

 to No. 7, in neat horn mounting . . . . 180 



1092. SPECTACLE TEIEES, as above, from No. 8 to No. 14, in neat horn mounting 



1 12 



1093. Trial Lenses, a complete series for every sight, consisting of 36 pairs of convex and 



36 pairs of concave spherical lenses, 18 pairs convex and 18 pairs concave 

 cylindrical glasses, with 12 prisms, 2 blank discs, 4 discs with small apertures, 

 3 colored glasses assorted, of most approved tints, with graduated adjusting 

 frame for holding the various lenses, in mahogany case complete 7 



1094. TEIAL LENSES, as above, consisting of 24 pairs convex and 24 pairs concave 



spherical lenses, 9 each convex and concave cylindrical glasses, 6 prisms, 

 2 blank discs, 2 discs with small apertures, 3 colored glasses of most 

 approved tints, with graduated adjusting frame for holding the various 

 lenses, in mahogany case complete . . . . 5 10 



1095. Haild Reading Glasses, of best make, for examining maps or photographs, in 



German silver, with polished ebony or ivory handles (fig. 1095), p. 100 : 



The above glasses in brass (gilt) Is. to 3s. 6d. each extra. 



1096. HAND HEADING GLASSES, oblong square, in German silver, with polished ebony 



handles (fig. 1096), p. 100 ; 2f inch., 3s. 6d. ; 3 inch., 4s. ; 3 inch., 4s. 6d. ; 

 3finch 056 



1097. Hand Reading Glasses, as No. 1095, in polished hardwood frames, with brass 



sockets (fig. 1097) ; 3 inch., 7s. 6d. ; 3f inch., 8s. 6d. ; 4 inch., 10s. 6d. ; 4^ inch., 

 12s. 6d. ; 5 inch., 15s. 6d. ; 6 inch., 1 ; 7 inch. . . 140 



1098. MAGNIFYING LENSES, single, in horn or shell mountings, folding for the pocket, 



very convenient for florists, mineralogists, etc. (fig. 1098), Is. to 4 6 



1099. MAGNIFYING LENSES, double, in horn or shell mountings, 2s. to 076 



1100. triple, to use together or separately, in horn or shell 

 mountings (fig. 1100), 3s. to . , . . . 10 6 



