Letter from F W Bowden, City & Guilds of London Institute, Technical College, Finsbury, Leonard Street, City Road, London, to [John] Perry He gives the results for two experiments suggested by Perry: a Leiden jar experiment, in which the electrometer was too sensitive to read the necessary voltage, a difficulty which was overcome; and a second with a magnetic field. He sketches the latter, involving the rise and fall mercury in a standpipe with an electromagnet providing current and reversed current within the tube. 26 February 1895