Third letter from S Brodetsky, regarding a paper 'The general motion of the aeroplane' by S Brodetsky Sectional Committee: Engineering Requests a further six copies of the paper, as the National Physical Laboratory has asked him to carry out some researches, and his colleagues at the University of Leeds will require copies for the research. [Published in the Philosophical Transactions of the Royal Society] Endorsed on recto as received 15 January 1940. 14 January 1940