Copy letter from Robert William Frederick Harrison, to Charles Algernon Parsons, Heaton Works, Newcastle on Tyne Harrison explains that they have no further copies of 'On the Whirling and Vibration of Shafts' by Stanley Dunkerley in separate form, and that there is no more recent paper of his published by the Royal Society. He suggests that Parsons contact Dulau & Company to enquire if they have a separate copy. [15 April 1907]