Title: Method of reproducing an electrostatic charge pattern in intensified form

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Abstract: An original electrostatic charge pattern on an electrically insulating image-bearing surface is reproduced, on an electrically insulating film, in an intensified form by the steps of: A. placing one surface of the film in contact with the original charge pattern on the image-bearing surface, B. wiping, with a grounded wetted sponge, the other surface of the film to induce thereon a monopolar charge pattern of opposite polarity to that of the original charge pattern, C. separating the film from the image-bearing surface and wiping, with a grounded wetted sponge, said one surface, whereby to induce a bipolar charge pattern on the film, D. disposing said one surface of the film in contact with the image-bearing surface so that the electrostatic charge patterns of the same polarities contact each other and are in register with each other, E. wiping, with a grounded wetted sponge, said other surface of the film to induce thereon a monopolar electrostatic charge pattern superimposed on the bipolar charge pattern, and F. repeating the steps (c), (d), and (e), if necessary, until the reproduced electrostatic charge pattern on the film is of a desired intensity.


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