
Copper earthing tube believed to have been used by Marconi, 1890-1897
1890-1897
1890-1897
1900-1920
1885-1895
1914-1918
1915-1918
1914-1918
1900-1920
1870-1910
1875-1885
1871-1900
1870-1920
1880-1920
1870-1920
1914-1918
1880-1915
1901-1916
1870
1880-1920
1900-1916
1881-1900
1869-1900
1900-1913
1870-1916
1904
1900
1914
1880-1920
1880-1910
1880-1920
1871-1900
1871-1900
1900-1914
1901-1920
1914-1918
1880-1919
1884-1900
1900-1920
1880-1910
1901-1905
1880-1920
1895-1904
1870-1901
1890-1914
1879-1896
1890-1900
1872
1880-1920
1880-1920
1874-1902
circa 1919