Referee's report by Owen Willans Richardson, on a paper 'The ionisation of potassium vapour' by Robert William Ditchburn and F L Arnot Sectional Committee: Physics Recommended for publication in the 'Proceedings of the Royal Society of London'. Refers to Kunsman [?]. 'The authors should be informed that unless Kunsman has changed his name recently he spells it with an s'. [Published in the 'Proceedings of the Royal Society of London' A, 1929] Endorsed on verso as received 2 February 1929. [February 1929]