![](https://coimages.sciencemuseumgroup.org.uk/57/87/large_thumbnail_1981_0252__0002_.jpg)
Whitworth standard wire gauge
1869 to 1897
1869 to 1897
1855
1850-1857
1850-1857
1889
before 1889
1835-1865
1860-1895
1883
before 1889
1902
1883
1850-1857
1850-1857
1889
1871
1839
1835
1850-1857
1850-1857
1850-1857
earliest 1857
1850-1857
1849
earliest 1857
1897
1871
1857
1833-57
1846
circa 1876