central panel developed in the later bindings into elaborate curvilinear interlacings combined with arabesques sometimes enclosed in roll-produced borders". Analysis of the surviving bindings shows that Grolier patronised several workshops over the years. Only a limited amount of information is known about the bookbinders involved: some bindings are in an identifiable style (for example "Grolier's last binder"), while documentary evidence allows a few of the binders to identified by name: Geoffroy Tory (d. 1533), a Parisian printer and bookbinder best known as a designer of type for printing Jean Picard, a Parisian bookbinder and bookseller. Picard was active in the 1540s and, up to 1547, combined his bookbinding with holding the Paris agency of the Aldine Press. The Grolier Club of New York City was named after him by Walter Montgomery Jackson (1863–1923), who had also commemorated him in the publisher, Grolier, that he founded. Horology During his retirement he invented the “Turtle Clock”. This is a mysterious apparatus consisting of a hidden clockwork oriented face up, like a 16th-century table clock, beneath a non-ferrous plate whose rim shows the twelve numbers of the hours. The hour hand rotating underneath the plate has a magnet which causes a man-made floating turtle (with a longitudinal iron bar in its body) to point its head toward the appropriate hour. Gallery of bindings made for Grolier See also Nicolas Grollier de Servière (1596–1689), Jean Grolier's cousin, a French inventor who became well known for creating a series of fantastic machines. Notes References Harthan, John P., Bookbinding, 1961, HMSO (for the Victoria and Albert Museum) Hobson, Anthony, Renaissance book collecting: Jean Grolier and Diego Hurtado de Mendoza, their books and bindings, 1999, Cambridge University Press, , , google books Further reading Andrews, William Loring, Jean Grolier de servier Viscount d'Aguisy : some account of his life and of his famous library, 1892, DeVinne Press. Austin, Gabriel, The Library of Jean Grolier, A preliminary Catalogue, with introductory essay by Colin Eisler, "Jean Grolier and the Renaissance", 1971, New York, The Grolier Club I. de Conihout, On Ten New Groliers. Jean Grolier's First Library and His Ownership Marks Before 1540, New York : Grolier Club, 2013. External links British Library - Search on "Grolier" for images and catalogue entries for over 30 bindings owned by Grolier, and others in the style. Full-text biography - Jean Grolier de Servier Viscount d'Aguisy : Some Account of His Life