The metric system of weights and measures was legalized in January 1893.
Its use is legalized in Egypt, Great Britain, Japan, Russia, Turkey and the United States.
All that was done was done step by step. First, marriage between the two orders was legalized.
In 1875 Sir Frederick Abel, at the request of the British Government, began to investigate the matter, and in August 1879 the " Abel test " was legalized.
Free commerce with foreigners - a fact after 1809 - was definitely legalized in 1818 (confirmed in 1824).
