Photograph of Strange effect of the discharge of a Ch[rist] Ch[urch] Can(n)on on St. Paul's [Henry Longueville Mansel, Regius Professor of Ecclesiastical History and Dean of St. Paul's, 1868, and sometime Bampton Lecturer, exploding above St. Paul's cupola; orig at MS. Top. Oxon. a. 78, fol. 34] [John Johnson 132] by Thomas Shrimpton & Son publ., [c.1868]