Letter from Derek Price at Yale University, U.S.A., forwarding a copy of a letter sent to him by David Pingree of Harvard, about a description of a water clock in an 15th century Indian text, 1960-04-09 - 1960-04-12, GBR/1928/NRI/SCC2/105/1/15. The Papers and Possessions of Joseph Needham, GBR/1928/NRI/NRI2. Needham Research Institute. https://archivesearch.lib.cam.ac.uk/repositories/21/archival_objects/345787 Accessed February 18, 2025.