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Charles Cammell and Co, of Cyclops Steel and Iron Works, Sheffield.
formerly Johnson, Cammell and Co
1856 Mention as Charles Cammell and Co 
1861 Started to make rails and railway material
1863 Began making armour plates.
1863 The business had now grown so large as to necessitate further extension and development of the works so additional works were erected at Grimesthorpe, near Sheffield
1864 Mention as Charles Cammell and Co 
1864 The business was converted into a limited company.
1865 Became a publicly quoted company
1865 Acquired the Yorkshire Steel and Iron Works, at Penistone.
1866 Mention as Charles Cammell and Co (Limited) of Cyclops Steel and Iron Works 
1870 Factory opened in Dronfield, manufacturing railway wheels and steel rails (see Wilson, Cammell and Co).
1873 Acquired the Oaks Colliery, near Barnsley, thus ensuring supplies of their various raw material
1873 BA meeting: Cammell and Co
1875 Death of Thomas Broadley age 76 'upwards of 25 years in the employ of Charles Cammell and Co' 
1876 Of Cyclops Steel and Iron Works, Sheffield; the Yorkshire Steel Works, Penistone; and the Oaks Collieries near Barnsley.
1878 Sheffield supplier of armoured plate to the Italian warship Duilio
1879 Death of Charles Cammell Founder and Chairman
1880 Armoured plate for naval vessels
1885 Company consisted of 
1894 John Barker, the manager of Grimesthorpe, retired after 45 years service.
1896 The Solway Works of Beckermet Mining Co were bought by the company
1898 Became a public company as Charles Cammell and Co. The company was re-registered on 4 January in connection with a reconstruction of the capital.
1901 Of Cyclops Works, Saville Street, Saville Street East and Carlisle Street East and Ordinance Steel Works, Grimesthorpe; and Yorkshire Iron and Steel works, Penistone and Derwent blast furnaces, iron and steel works, Workington; Solway Iron Works, Maryport and Old and New Oaks collieries, Barnsley were boiler and ship plate manufacturers