Interior view of the Government Laboratories, by Halftones Limited A male technician wearing protective gloves to remove tobacco samples from an oven, one of a range, at the Government Laboratories at Clement's Inn Passage, Strand, London. Duplicate of MS/373/4/27. Captioned in pencil verso: 'Determination of the Ash in Tobacco'. Stamped: 'Copyright, Halftones Limited. 17, Fleet Street, E.C.', and inscribed 'Fee 5/-'. c.1901 [?]