Percy Ludgate (1883-1922), Ireland's first computer designer

A greatly expanded treatment is presented of the history of the family, life and work of Percy Ludgate, nearly 50 years after the 1971 and 1982 -papers by Brian Randell revealed his work on a mechanical computer, and almost 100 years after Ludgate's death. The new material that has recently been -obtained about this successor of Charles Babbage includes two very significant discoveries. The first is of a hitherto unknown contemporary published description of Ludgate's Analytical Machine, incorporating the only surviving drawing of it yet found; the second is of American descendants of -Ludgate's niece, who have been allowed to erect a commemorative headstone on his previously unmarked grave.