Correspondence with tradesmen, initials A-M, including letters from booksellers; coal merchants; clock repairers; horologists; builders; chandlers; merchants; draughtsmen; chemists, decorators; journeymen; bookbinders; import agents; the Kent Water Company; glass makers; and a gas fitter. The letters cover various instructions; requests; accounts; invoices; bills; circulars; receipts; tenders; routine repairs; and adjustments and improvements to instruments. There are notes by J. Glaisher; instructions to J. Green and drawings relating to the construction of an observing chair; and material on the connection between the Royal Observatory and Lewisham railway station by telegraph.