Postcard image of Dizi Perpendicular. V&A collection, London. On display at the Horniman Museum, London.Holderness dital harp (after, or possibly by, Egan)Late 19th-century Erard - Pilgrim HarpsRudall Carte (formerly Erat Harps) c.1920Plate from Nielson Method showing Erat spring of supportDetail from Schwieso patent published in the HarmoniconHughes Brothers - postcard from Ann GriffithsLate 19th-century Erard compliment slipGrosjean label in mid 19th-century guitar (private collection)Erard publicity leaflet - Gothic HarpFront plate of Stumpff auction catalogueGroll patent drawing 1807Erard patent drawing 1808Erard patent drawing 1810Photograph by kind permission of the Clive Morley Harp Collection Photograph by kind permission of the Clive Morley Harp CollectionPhotograph by kind permission of the Clive Morley Harp CollectionPhotograph by kind permission of the Clive Morley Harp CollectionPhotograph by kind permission of the Clive Morley Harp CollectionPhotograph by kind permission of the Clive Morley Harp CollectionPhotograph by kind permission of the Clive Morley Harp Collection
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