Glossary, ContinuedXXEROGRAPHY— A copying process that uses electrostatic forces to forman image.ZZINC WHITE— A zinc oxide based pigment that is less opaque than titaniumand lead white.ZIP-A-TONE— A transparent acetate sheet preprinted with patterns of dotsor lines that create tone.ZONE NUMBERS— Numbers and letters on the border of a drawing toprovide reference points to aid in locating specific points in the drawing.ZOOM LENS— A variable focal-length lens that functions as a telephoto lensbut allows you to select the range of the object magnification.AI-67
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