Hartmann publishes diptych sundials manual In 1533, Georg Hartmann published a manual on making diptych sundials (just after he created, around 1532, the Brass Planispheric Astrolabe – coming soon to Clocktime). Further Reading Ackermann, S. 1998. ‘EPACT: Scientific instruments of medieval and Renaissance Europe.’ http://www.mhs.ox.ac.uk/epact/index.php. Karr Schmidt, S. 2018. ‘Georg Hartmann as interactive printmaker’, in Karr Schmidt, S. Interactive and Sculptural Printmaking in the Renaissance (Brill’s Studies in Intellectual History, Volume 270/21). Leiden: Brill, pp. 205–240. Ward, F. A. B. 1981. A Catalogue of Scientific Instruments in the Department of Medieval and Later Antiquities of the British Museum. London: British Museum Press. Image Credit Georg Hartmann, Diptych-dial, 1562, The British Museum © The Trustees of the British Museum, CC BY-NC-SA 4.0, diptych-dial; sundial; compass-dial | British Museum.
