Letter, from Richard Sheepshanks to Sir John Herschel, dated at Trinity College Autograph letter signed by sender. Assures John Frederick William Herschel that engravers typically take for themselves a few copies of any print they have made. If a large number of these appear for sale, then it is fraud. Suggests John Frederick William Herschel not act because the engraver is 'insane' and the exposure would hurt his family. 27 February 1840