Copy letter from Herbert Rix, to Messrs Drake & Gorham 'Dear Sirs, I understand that you have given Mr Preece an oral estimate for eight new sections for our battery, the charge to be £28 including acid, labour, and carriage of old plates to works. This estimate is accepted and I trust that the matter is by this time put in hand. I am, faithfully yours, Herbert Rix Asst Sec RS [Assistant Secretary, Royal Society]'. 15 January 1889