| Eadweard Muybridge [Muybridge's use of electo-magnetic shutters to capture motion] 1899 Book illustration Flickr Internet Archive Book Images LL/55556 Henry V. Hopwood, 1899, Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography, (London Optician & Photographic Trades Review), p. 49, fig. 50
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