the signal amplitude which conventional chaff reflects because of the triplanar corner cubes facing oppositely on each strip 61 both obverse and referse chaff sides reflect efficiently as the ribbon twists and falls thus radar will 34 see 34 large stronger imagery on the detection screens in the absence of any aircraft that is usually represented by the signal return from conventional chaff the strip 61 can be made in a ribbon form with only the two reversed rows of cube corners extending the length of the ribbon alternatively two four or six rows may be utilized depending upon the reflected image desired fig1 through 14 illustrate the steps of a process for forming a die blank by which the pattern of the cube corners may be pressed on foil sheets in fig1 and 12 a blank 71 is being cut by a grinding wheel 72 the grinding tool rotates in a plane perpendicular to the flat surface of the blank and the tool 39 s cutting edge is a symmetrical dihedral angle of 70 529 u00b0 approximately first the triangular groove like the grooves 74a are cut along the length of the blank the face of the die blank then has the appearance shown in fig1 in the area of line 12 12 and the cross sectional configuration of fig1 the orientation of the blank and the cutting path of the grinding wheel 72 is then changed such that the wheel scribes a symmetrical groove along diagonal lines 75 at an angle 60 u00b0 to the previously ground grooves 74a the blank.