Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,390 pages of information and 211,458 images on early companies, their products and the people who designed and built them.
Britannia Works, Huddersfield.
1843 Company established.
1894 Incorporated as a Limited Company.
1895 Advert. Parallel slide blow-off valve. 
1899 Advert. Parallel slide blow-off valve. 
1904 A new factory was built covering 15 acres; employed 1,500 men.
1905 Advert for high steam safety valves and boiler mountings. 
1913 Advert for high steam safety valves and safety boiler mountings. 
1914 Manufacturers of Patent Valves and Safety Boiler Mountings. Specialities: Hopkinson boiler mountings and steam stop valves, high-class steam specialities. Employees 600. 
1917 Advert for the 'Triad' junction valve and safety boiler mountings. 
1919 Advert for stop valve. 'Upwards of 30,000 supplied'. 
1920 May. Issued catalogue on boiler-mountings and valves and other items. 
1920 J. Hopkinson and Son was registered as a limited company.
1926 Public company - see Hopkinsons