
Thomson's mirror marine galvanometer, 1858
1858
1858
circa 1861
1862
1858
1869
1830 (original); 1967 (model)
1870
circa 1861
1867
1867
1859
1858
1867
1865-1866
1858
1863-7
1860
1862
1870
1857
1865
1857-1858
1857-1858
1858-03-02
1866
1865
1867-1868
1860
1955; 1830
1870s
1861
1861
1893-4
1934
2000-100 BCE
1861-1866
1864
1857-1870
circa 1868
1858
circa 1860
1857-1858
1865
1867
1857
1865
1860
c1860
1864
1705-1737