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Intended as an overview of available secondary works on non-calendrical timekeeping instruments. Grouped into the following categories:
Miniature de "Horologium Sapientiae" vers 1450 de Henrich Seuse
Bibliothèque Royale Albert, Bruxelles MS. IV, f. 111
Giovanni Cassini. Heliometer in the Church of San Petronio in Bologna (1695)