166 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



taking off the glare of light, 

 but allowing objects to be 

 seen with distinctness, also 

 keeping of all dust and wind 

 that would injure the eye, 

 even in a weak state, with- 

 out destroying that ventila- 

 tion necessary for the health 

 of the eye. They are also 

 particularly serviceable in 

 riding in rail-road cars ; the 

 sparks from the cinders fre- 

 quently occasioning serious 

 accidents by their falling in 

 the eye, which the use of 

 these will prevent. 



Price, $1.00. 



(Fig. 654.) They are also 

 set with glasses in the centre 

 of the cup, as represented in 

 tire cut, which may be white, 

 or shaded blue, grey, or 

 green ; either convex, or con- 

 cave, but usually with plane 

 surfaces, neither magnifying 

 nor diminishing. 



Price, $1.00 and $1.25. 



