Thomson's mirror galvanometer, 1858
1858
1858
1870s
1870
c1860
1858-03-02
1855
1877
1859
1860-1920
circa 1868
1938; (1838)
1859
1860
1853
1853
1852
1852
1860-1870
1860-1870
1855-1860
1860-1870
1860-1870
1860-1870
1860-1870
1860-1870
1863
1860
1860
1870
1871
1853
1861-1866
1860-1877
1876
2000-100 BCE
1860-1877
1860-1877
1872 (original); 1909 (model)
1864
1870s
1875
1834-1836
1876
1854
1872
1862
circa 1860
circa 1863
1855-1870
1872