Letter from [Alan Archibald Campbell] Swinton, to St. George Lane Fox Pitt [Esquire], 47 Chester Terrace, S. W. 1. Comments on the Editorial note in The Electrical Times for 14 February, which quoted from Pitt's abridged patent specification from 1879, describing his method of treating a carbon bridge by raising it to an incandescent state by sending a current through it while it is immersed in a dense hydrocarbon. Enquires if Pitt has seen Fleming's paper on the carbon incandescent lamp in the Journal of the Institute of Electrical Engineers. Further discusses patents. 20 February 1929