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1850 Slater's Directory of Manchester & Salford, 1850 lists William Crossley, iron and brass founder, engineer and millwright, Alum Street Iron Works, 33 Alum Street, Ancoats: House 28 Mill Street. Adshead's 1851 Maps of Manchester, Map 14, shows the premises, identified as belonging to W Crossley. Area approx 2000 sq yds. Located alongside the Rochdale Canal and bounded by the canal, Allum Street, Cotton Street and Albion Buildings. Also shown on the 1849 O.S. map as Allum Street Foundry (Engineer and Mill Work) 
Note: No known connection with William John Crossley