
Kilo-ampere balance (a) Box containing sliding weights
1888
1888
1879
1869
1884
1872-08
1870
1870
1870
1880
July 1867
circa 1864-circa 1875
1868
1887
circa 1888
1875-1885
circa 1886
1875
1872
1860-1875
circa 1875
1888; 1984
1865-1875
circa 1876
1871
1871
circa 1862
circa 1863
1865
1858
1882
1875-1885
1859-1865
1859
1865-1875
1889
1883-1886
1860-1865
1865-1875
1875-1877
1873
1885-1887
1866-1875
1869
1774; 1923
1866
1860-1870
circa 1880
1860-1870
1870
1875