METHOD AND APPARATUS FOR DETERMINING MAGNIFICATION RATIO OF MICROFORM READER

摘要

A microform reader chart having a plurality of microimages thereon is used to determine the magnification ratio of a reader and for displaying various size character samples. The character font and spacing is duplicated in a plurality of frames of data, each frame being recorded at a different reduction ratio. The placing of the chart in a reader enables the user to determine in precise manner the magnification of the reader and to observe display of different print sizes and spacing thereof.