Correspondence with tradesmen, initials A-M, including letters from booksellers; coal merchants; horologists; builders; chandlers; merchants; instrument makers; the Kent Water Company; parcel carriers; chemists; photographic suppliers; decorators; journeymen; bookbinders; assayers; glass manufacturers; solicitors; stove makers; a gas fitter; and import agents. The letters cover various instructions; requests; accounts; invoices; bills; receipts; circulars; tenders; routine repairs; and adjustments and improvements to instruments. There are also notes by J. Glaisher and a list of customs duties.