June, '16] 



WOGLU.M: FIELD BINOCULAR MAGNIFIER 



371 



Fig. 20. A handy binocular 



The magnification approximates that of the ordinary hand lens^. 

 but the flat field produces very little strain to the eyes even when 

 used continuously for an hour or more. In counting or observing 

 such small insects as Coccidse, in examining plants and seeds, writing 

 small labels, making fine drawings, and the like, the writer's experience 

 has found this magnifier decidedly superior to a hand lens becausejit 

 requires no manipulation, is less trying to the eyes, and enables the 

 use of both hands. 



