OPTICAL INSTRUMENTS. 



155 



Oval Eye Tortoise- Shell Spectacles, with Single Bows. 

 (Fig. 636.) Tortoise-shell mounted spectacles are worn for 

 extreme lightness, and are pleasant to wear, but liable to be 

 easily broken ; they are sometimes mounted with silver, or 

 gold bows, having single or double branches. 



Price, single side, $2.00 ; turnpin side, $3.00. 

 " with silver bows, $3.00 and $3.50. 



Spectacles for Reading and Public 

 Speaking. (Fig. 637.) Spectacles 

 adapted for read- 

 ing and public 

 speaking, having 

 the top of the rim 

 holding the glass 

 flat, and being 

 worn before the 

 eyes in such a man- 

 ner as to see 

 through the glass 

 in reading, and 

 over the frame in 

 speaking, and are 

 particularly use- 

 ful to clergymen 

 and other public 

 speakers, requiring 

 the use of spec- 

 tacles ; they are 

 mounted in silver, 

 fine steel, and 

 gold. 

 Price, in 



" silver, $2.80. 



" in fine 



steel, $2.50. 

 and $3.00. 



" ordi- 

 nary, $1.50. 



" gold, $10.00. 



