Northern General Hospital. This occupies a large site and was originally built as the Sheffield Union Workhouse and Infirmary between 1876 and 1880 (Harman & Minnis 2004,183-184). The infirmary and the workhouse became separate institutions in 1906. This polygon shows the later development of the hospital. Prior to the hospital development the area is shown as fields on the 1st edition OS map of 1854. Legibility of this part of the hospital complex is invisible.