|Alternative reference number
|Copy letter from Robert William Frederick Harrison, to [Messrs Harrison & Sons]
|10 July 1905
|Asks the Messrs to make electors of the blocks used to illustrate Messrs Mees & Sheppard's paper on 'The Theory of Photographic Processes on the Chemical Dynamics of Development'. The charge for these is to be made to the Royal Photographic Society of Great Britain.