Correspondence with tradesmen, initials N-W, including letters from booksellers; coal merchants; builders; chandlers; instrument makers (particularly Troughton and Simms); stationers; opticians; parcel carriers; engineers; and carpenters. The letters cover requests; accounts; bills; receipts; tenders; invoices; routine repairs; adjustments; improvements; and shutters for observing domes. There are letters from F. Baily, J. Glaisher and J.H.V. Vian.