Copper earthing tube believed to have been used by Marconi, 1890-1897
1890-1897
1890-1897
1880-1920
1891-1930
1968
1968
1968
1968
1968
1955-1960
1968
1968
1968
1968
1979
1955-1960
1955-1960
1979
1950-1980
1861-1920
1871-1930
1910-1940
1871-1920
1862-1894
1979
1979
1930-1940
1979