Base for planimeter patented 1904 by Connolly Brothers
Base for planimeter patented 1904 by Connolly Brothers, London. The base is circular, with a hole in the centre. Text on the top reads 'Connolly's patent'.
Base for planimeter patented 1904 by Connolly Brothers, London. The base is circular, with a hole in the centre. Text on the top reads 'Connolly's patent'.