| GENERAL CHARACTERISTICS ITEM DESCRIPTION | STEEL AND GLASS,O/A DIM.,2.188 IN. LG,2.188 IN. W,1.625 IN. THK,APERTURE 1.000 IN. BY 1.000 IN.,A PENTAGONAL PRISM HAVING THE PROPERTY OF DEFLECTING A BEAM OF LIGHT THROUGH A RIGHT ANGLE,IRRESPECTIVE OF THE ANGLE OF THE BEAM TO THE PRISM FACE |