Interior view of the Government Laboratories, by Halftones Limited Showing Thomas Edward Thrope standing on a low box at a laboratory bench, using a lens to peer into a container. Various other technical staff of the Government Laboratories at Clement's Inn Passage, Strand, London, are at work. Not captioned verso. Stamped: 'Halftones Limited. 17, Fleet Street, London, E.C.'. c.1901 [?]