johnbr
2nd Lieutenant
GERMANY - JANUARY 22: The German airships 'Zeppelin' and 'Parseval', Liebig trade card, c.1910. 'La Navigazione Aerea' (Aerial Navigation). One of a set of Italian Liebig trade cards showing the airships adopted by the German military and used by both sides in World War I. After the war, the Germans abandoned the use of Zeppelins because of their failure in air raids against Britain and their natural vulnerability to anti-aircraft fire. The Liebig company produced sets of trade cards to promote their meat extract, a cheap and nutritious product invented in 1847 by chemist, Justus von Liebig. The meat extract was produced from 1865 at the Fray Bentos - Liebig processing plant set up in Uruguay. 1,863 sets of cards were produced continuously from 1872 until 1975 by which time the company had joined with Brooke Bond to become Brooke-Bond Oxo and was owned by Unilever. (Photo by Science & Society Picture Library