Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
Fritz Haber (1868-1934) found a solution to the problem of dwindling nitrate deposits in Chile, which were used in the manufacture of fertilizers. He received the 1918 Nobel prize in chemistry "for the synthesis of ammonia from its elements" by subjecting hydrogen and nitrogen to high pressure in the presence of a catalyst. On the industrial scale this resulted in the Haber-Bosch process.