Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Ship | Laid down | Builder | Engine-builder | Launched | Completed | Disposition | Fate |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Comus | 17 August 1876 | John Elder | John Elder | 3 April 1878 | 23 October 1879 | Struck 1902 | Sold for breaking 1904 |
| Curacoa | 17 August 1876 | John Elder | Humphrys, Tennant & Company | 18 April 1878 | 24 February 1880 | Seagoing tender | Sold for breaking 1904 |
| Champion | 17 August 1876 | John Elder | John Elder | 1 July 1878 | 7 December 1880 | Stokers' training ship | Sold for breaking 1919 |
| Cleopatra | 17 August 1876 | John Elder | Humphrys, Tennant & Company | 1 August 1878 | 24 August 1880 | Training ship; overflow hulk | Sold 1931, broken up 1933 |
| Carysfort | 17 August 1876 | John Elder | John Elder | 26 September 1878 | 15 September 1880 | Paid off 1901 | Sold for breaking 1899 |
| Conquest | 17 August 1876 | John Elder | Humphrys, Tennant & Company | 28 October 1878 | 18 April 1885 | Paid off 1894 | Sold for breaking 1899 |
| Constance | 14 September 1878 | Chatham | John Penn and Son | 9 June 1880 | 3 October 1882 | In reserve 1889 | Sold for breaking 1899 |
| Canada | 7 July 1879 | Portsmouth | J. & G. Rennie | 26 August 1881 | 1 May 1883 | In reserve 1896 | Sold for breaking ca. 1898 |
Question:
When was the stokers' training ship launched?
Answer:
1 July 1878