Referee's Report by [John Douglas] Cockcroft on a paper 'The investigation of electron lenses' by [Otto Ernst Heinrich] Klemperer and W D Wright Paper reference code: A.64 Sectional committee: Physics Believes the paper is suitable for publication in Transactions [Philosophical Transactions of the Royal Society]. 'I can only report on the paper from the point of view of its general interest in applied physics + on the electrical theory involved. It might be well to get a report from a referee with knowledge of optical lens design'. [Not published]. Received 20 April 1938 16 April 1938