A manufacturer's poster showing the parts of one of the most useful meteorological instruments ever devised. The speed of the wind was sensed through an open tube at the top of a tower or building, and the record was drawn on a rotating drum under cover below. The design required very little maintenance and was used all over the world, particularly in les developed areas where specialist advice was thin on the ground. The first were made in 1892 and some were still in use in the late 1950s.
© Science Museum / Science & Society Picture Library