Copy letter from an unknown correspondent, Messrs Clay & Sons, University Press, Cambridge 'Will you have the goodness to make us a cliché of the diagram indicated on the enclosed memorandum of Sir William Thomson's? If you can oblige us in this matter, please send the a/c [account] of expense here and send the cliché to Messrs Harrison & Sons, 45 St Martin's Lane. The cliché is wanted for a paper which is to be read here next Monday morning'. 5 June 1891