Documento NOR/01/006 - Correspondence, drawings and sketches relating to Tompion clocks at Greenwich

Includes annotated typescript of "The Tompion Clocks at Greenwich and the Dead-beat Escapement" by Derek Howse, an article published in Antiquarian Horology (December 1970); pages from the Horological Journal (October 1962) on Tompion pallets; and Northcote's correspondence with Howse, with notes and sketches.