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Taylor and Challen of Derwent Foundry, Birmingham
of 187 St. Stephens House, Westminster, London, SW1 (1937).
also of Constitution Hill, Birmingham. Telephone: Central 5672/4. Telegraphic Address: "Derwent, Birmingham" (1937).
Business founded by Joseph Taylor, later Taylor and Co, and then Taylor and Challen.
1839 Partnership dissolved between Alexander Dean and Joseph Taylor, engineers, Birmingham. Trade to be carried on by Taylor
1856 Beam engine built by Taylor's for the Charlotte Street saw mills. 
1858 Advertised as Joseph Taylor, Engineer & Machinist, Broad Street Iron Foundry, opposite King Edward's Place, Birmingham. Manufacturer of steam engines, coining machinery, saw and rolling mills, pumps and machinery of various kinds
1861 Workshop built.
1875 Taylor senior retired
1875 Advertised as Taylor & Co, Derwent Foundry, Constitution Hill, Birmingham, engineers and makers of stationary steam engines, nut forging machines and other special machinery, shafting, pullies and carriages.
Sometime between 1875 and 1880 the firm became Taylor and Challen
1889 the business was reformed into a private company; Joseph Taylor senior was appointed chairman.
1894 Catalogue of Shafting, Shaft-fittings, Pulleys etc. 
1900 Screw Press and Guillotine Shearing Machines. Article and illustrations in The Engineer. 
1908 Gunpowder machinery catalogue - scanned pages available online
1912 Exhibitor at the Non-Ferrous Metals Exhibition at the Royal Agricultural Halls.
1920 Advert. Maker of presses for sheet metal etc.
1925 Patent - Improvements relating to hand guards for presses and like machines. 
1927 See Aberconway for information on the company and its history.
1937 Power press manufacturers. 
1937 Listed Exhibitor - British Industries Fair. Crank Screw Presses for Hot Brass Stamping. Roll Feed Press for quick production from strip steel. Automatic Notching Press, for armature discs. 
1961 Mechanical engineers manufacturing power presses, minting and cartridge machinery. 470 employees. 
1968 Details of their new open-fronted presses rated at 40 - 100 tons. (Of Constitution Hill, Birmingham). 
1974 Mr. J. E. Pearson was appointed associate sales director and Mr. R. E. Baugh was appointed associate engineering director.
1976 In view of the declining demand, products had already been focussed on hot brass forging presses and coining presses. Production was then concentrated at the nearby premises of Wickman Scrivener
Machinery for Producing Gun Barrels
1863 The Practical Mechanic's Journal described and illustrated an example of gun barrel rolling machinery made by the firm for Colt's Small Arms Co. of Hartford, USA. The article noted that a set had also been made for the Government Small Arms Manufactory in Enfield. In 1862 he sent 11 sets to Harper's Ferry and Springfield, to replace earlier machinery which the Confederate forces had taken from Harper's Ferry to Richmond. 
More information on the gun barrel rolling machinery is available in 'From Under Iron Eyelids' by Thomas K. Tate
1870 Multiple drilling machine for gun barrels described in 'Engineering'. See illustration. Six steel bars 2¼" diameter, 8" or 9" long, were drilled at a time, ready for rolling to form gun barrels
The firm produced a range of machinery, including presses and steam engines for a number of mints, including the Royal Mint in Sydney in 1854 (see illustrations), and the Melbourne Royal Mint in 1868
They also equipped the mint in Bangkok in 1858, and sent out a new press in 1865