Most of Browne's "Phiz's" work was etched on steel plates because these yielded a far larger edition than copper. Phiz was annoyed at some of his etchings being transferred to stone by the publishers and printed as lithographic reproductions. Partly with the view to prevent this treatment of his work, he employed a machine to rule a series of lines over the plate in order to obtain what appeared to be a tint; when manipulated with acid this tint gave an effect somewhat resembling mezzotint, which at that time it was found practically impossible to transfer to stone. You can see that in the original image above left. How is that for pre-copyright infringement protection!
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