Lighthouse illuminants (South Foreland experiments). Copy of memorials from shipowners of various ports in the United Kingdom (with the signatures thereto), asking for further inquiry into the report of the Trinity House on the South Foreland experiments on lighthouse illuminants, and addressed to the Most Honourable the Marquis of Salisbury as Prime Minister, and by him referred to the Board of Trade; and also the correspondence which has taken place on that subject between the Board of Trade, the Trinity House, Professor Stokes, M.P., president of the Royal Society, and Mr. J. R. Wigham on his own behalf, and on behalf of shipowners and others interested in the question (in continuation of Parliamentary Paper, no. 70, of session 1888) [electronic resource].