 Complete the following phrase:  In 1841 he moved to his familys estate of Chateau Miraval in the Department of the Var Southern France, where he applied himself to agriculture. It is around that time that he started constructing water tanks and troughs using cement mortar masonry and iron reinforcement most likely in the form of iron rods, chicken wire which was invented in Britain in 1844 and used for shipping crates and possibly barrel bands that were easily available with the arrival of the machine age. In 1848 he constructed his first boat using the same system, which he tested on ponds on the estate. This boat was patented on 30 January 1855 and presented at the 1855 Worlds Fair in Paris 