Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,100 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
François and Alexandre La Rochefoucauld
As young men, they spent time in England with their tutor, Maximilien de Lazowski, and recorded their observations, including accounts of agricultural practices and industrial production methods. These findings have been made available in English by Norman Scarfe. 
François XIII, duke of La Rochefoucauld (b.8 September 1765, Paris - 3 September 1848) was the heir and eldest son of François Alexandre Frédéric, duc de la Rochefoucauld-Liancourt. On 24 September 1793 he married Marie-Françoise de Tott (1770–1854) at The Hague.
Alexandre-François de La Rochefoucauld (b. 26 August 1767 in Paris, d. 2 March 1841 in Paris)