Curators of the Science Museum Group collection are keen for the public to help better understand the purpose of the items they care for on behalf of the nation.
This elegant apparatus is said to be an air purifier that was presented to Pope Leo XIII . It was made by Gisors in Paris, France, in 1894. It is a box-like metal structure (90 x 80 x 12cm) in a purpose-built silk-lined box.
Photograph: Peter Grugeon/Science Museum Group