"Mechanical threshing machine, Liebig trade card, c 1910-1920."
© Science Museum / Science & Society Picture Library
"'Batteuse mechanique', No 3 in the 'Notre Pain Quotidien' ('Our Daily Bread') set of trade cards. The bulk harvest from the field is fed into the top of the machine. A beater drum separates the ears from the straw, and rotary screens separate the chaff and weed seeds. The straw is ejected at the rear while the heavy grain falls to a collecting point and is then raised to a sack-filling chute. 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."