Unframed Slides. 



The Unframed Slides used in this country are mostly 3i 

 inches high and 4 or 41- inches from side to side. The pic- 

 ture openings, however, differ both as to size and shape. 

 The common round opening is necessarily somewhat less 

 than 21 inches in diameter, showing considerably less area 

 than the opening in our crystal slides here represented, 



whose diameter is 3? inches where most needed. The cres- 

 cent of sky and foreground thus cut from the enlarged picture 

 is scarcely a disadvantage to most subjects, while there is an 

 advantage in showing the full height of what is near the 

 side margins. We endeavor, therefore, to have all our 

 Unframed Slides correspond, in shaoe, size, and opening, to 

 he foregoing cut. 



