thumb|14th or early 15th century rotating bookmark from France. '''Rotating bookmarks''' were a kind of bookmark used in medieval Europe. They were attached to a string, along which a marker could be slid up and down to mark a precise level on the page. Attached to the marker was a rotating disk that could indicate the column (usually numbered one to four, indicating the two columns on the left-hand page, and the two columns on the right-hand page).
About 30 such rotating bookmarks have been recorded in libraries in continental Europe, and another half a dozen in England.
==References== *J. Destrez, ''L’outillage des copistes du XIIIe et du XIVe siècles'', in ''Aus der Geisteswelt des Mittelalters'', Martin Grabmann festschrift, 1935, 19–34 *R. Emms, ''Medieval Rotating Column-Indicators'', Transactions of the Cambridge Bibliographical Society, XII, 2001, 179–l-84).
==External links== * [http://www.miragebookmark.ch/wb_history.htm History of Bookmarks]
Category:Book terminology