Correspondence with tradesmen, including letters from booksellers; coal merchants; horologists; clock repairers; builders; chandlers; merchants; instrument makers; opticians; parcel carriers; chemists; journeymen; bookbinders; import agents; picture framers; slaters; the Kent Water Company; the Phoenix Gas Company; telegraph companies; and the South Eastern Railway. The letters cover various instructions; accounts; requests; invoices; receipts; bills; tenders; circulars; routine repairs; and adjustments and improvements to instruments. There are also notes by E. Dunkin, J. Glaisher and E.J. Stone.