OPTICAL INSTRUMENTS. 



163 



Horn Mounted Readers (Fig. 650) Consists of a large 

 convex glass set in a horn frame, folding into a case of the 

 same material, and are used for reading, &c., held in the 

 hand, midway between the object and the eye, but a slight 

 movement of the hand being made. The drawing represents 

 the usual size of the article. 



Price, $2.00 ; smaller size, $1.50 and $1.00. 



Fig. 650. 



