Letter from [Alan Archibald Campbell] Swinton, to The Editor, The Electrical Times Has recently read their interesting editorial and the communicated article on the invention of the glow lamp, with a copy of Mr. Lane Fox Pitt's patent both lent to him by Pitt. Believes he made plain to Mr Pitt's claims, in his communication to the Proceedings of the Institution of Electrical Engineers, that he was the first patentee of electrical distribution at constant potential, with everything in parallel. Adds that Pitt was also the first to patent what is now known as the gas-filled lamp. 12 May 1929