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of Imperial Steel Works, Sheffield 9. Telephone: Attercliffe 41054. Telegraphic Address. "Allen, Sheffield". (1937)
1867 Company founded by William Edgar Allen
Subsequently purchased Messrs. Hoole, Staniforth and Co., makers of similar products.
1890 Company took limited status. 
1891 The business was transferred to the present situation at Tinsley.
1892 Mr. F. A. Warlow joined the firm.
1900 The company was registered on 19 December, to acquire a business of iron and steel manufacturers. 
1914 Manufacturers of steel, steel castings, files, saws, tramway points and crossings etc.; crushing and separating machinery, conveyors, ball mills etc. Specialities: the Edgar Allen high-speed steel, central railway buffers, steel castings, tool steel, imperial manganese steel, elevating and conveying machinery. Employees 150. 
1917 Advert for various steels. 
1919 Advert for various steels. 
1920 Jan. Issued calendar. 
1927 Advert for various steels. 
1937 Steel makers and engineers. "K9" Steel Products. "£S. D." Steel Products. "Stag" Steel Products. 
1937 Listed Exhibitor - British Industries Fair. Stag Allenite Tungsten Carbide Tipped Tools. Stag Major Superweld Tools for turning, planing, shaping, etc. K9 and Double Six Die Steels. Stag High Speed Steel Twist Drills. Maxilvry Stainless Steel. (Stand Nos. D.831 and D.730) 
1952 Established Buell Ltd, to make rotary driers
1960 Design, manufacture and erection of plant for crushing, pulverizing etc. 
1961 Manufacturers of steels, engineers' tools, magnets, cement plant, grinding machinery, railway and tramway trackwork and steel castings up to 15 tons finished weight. 
The site was the home of the foundry and the fabrication shops of the company, the steel warehousing and magnet shops being on the opposite side of Sheffield Road and the later established engineers tools and railway track work sections being located adjacent to Shepcote Lane, on a narrow strip of land between that road and the Sheffield Canal. 
The Melting Shop used metal supplied from two cupola furnaces to feed a pair of Tropenas converters to supply metals to the foundry. These were similar to Bessemer vessels except that the air was blown through tuyères on the side of the vessel rather than the bottom.
The Electric Melting Shop was home to two Héroult electric arc furnaces, installed in 1912, still working when the site closed. These provided metal for the foundry and to ingot production for forging. The company also offered a "remelting" service for special alloy producers, in particular magnet alloys and stainless steels.
The Foundry comprised moulding shops, casting bays, fettling shops and machine shops, all suitable for castings up to three tons weight. Although larger castings were made by mixing metal from all the sources these were machined and finished outside. The remainder of the site comprised the Fabrication Shops, three bays laid out for the production of welded fabrications and heat exchangers. Following World War II a new laboratory block was added adjacent to the Sheffield Road entrance. This comprised facilities for Chemical Analysis, Physical Testing, Non-Destructive Testing, Mechanical Testing and Metallography. This facility also had its own small machine shop, for making mechanical test pieces, and a reference library / conference facility.
On the Sheffield Road site, a narrow, triangular section of land between Sheffield Road and the Sheffield to Doncaster railway line, opposite the Imperial site was at its apex the Magnet Dept, the steel heat treatment and warehousing section and fronting Sheffield Road the main company offices. A memorial to those workers from the company who lost their lives in World War I was fixed to the wall adjacent to the main doors.
The third section of the works was the Shepcote Lane site, between that road and the Sheffield Canal. This was the site used by Edgar Allen Tools, makers of "Stag" brand engineers cutting tools, and the layout facilities of the railway track work department, makers of some of the most complex railway crossings in the country including the major crossing built for the east end of Newcastle Central station where the tracks of the East Coast Main Line crossed the local network after leaving the station platforms. This was constructed in sections in Sheffield and re-assembled on site. With track rationalisation this crossing was simplified using a new configuration. In connection with EA Foundry (and their Non-Destructive Testing facility to ensure quality) they were the first in Britain to develop cast manganese high speed main line turnouts.
Mid-1960s it was seen that some rationalisation was needed within the Sheffield steel industry, particularly steel founding. With respect to this Edgar Allen split into separate companies: EA Foundry, EA Steels, EA Engineering, and with one of its subsidiaries, Aerex Limited, EA Aerex. Similar moves were taking place at Samuel Osborn and Co, Jessop Saville and Co and Hadfields
1967 The intention was to merge the foundry interests of the four companies to form one large steel foundry with the capability of making castings from a few ounces to 40 tons, with only English Steel Corporation's Grimesthorpe foundry in the city able to make larger castings. As negotiations were taking place the deal fell through leaving Osbourne's and Hadfield's to merge, with the foundry being located on Hadfield's East Hecla (Vulcan Road) site, and Edgar Allen's to purchase Jessop's, relocating Jessop's special alloy (medium frequency) melting to Edgar's Sheffield Road site and the 3-ton electric furnace to one end of the Tropenas Melting Shop.
1979 Aurora Holdings acquired Edgar Allen Balfour
1988 The Imperial works site closed with the work being transferred to another foundry within the group. The Sheffield Road site was also closed at the same time, cleared and now houses a budget price hotel and a catering outlet.