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G. and J. Weir of Holm Foundry, Cathgart, Glasgow and now known as the Weir Group.
1869/70. Patent. '3650. To George Weir, of Glasgow, in the county of Lanark, and James Weir, of Liverpool, in the county of Lancaster, Engineers, for the invention of "improvements in slide valves."' 
1871. Patent. '1936. And James Weir, of Glasgow, in the county of Lanark, North Britain, Engineer, has given the like notice in respect of the invention of " improvements in and connected with steam engines."— Partly a communication to him from abroad by George Weir, residing at Marseilles, and partly his own invention.'
1872. Patent. '262. To George Weir, of Glasgow, in the county of Lanark, North Britain, Engineer, and James Weir, off Liverpool, in the county of Lancaster, Engineer, for the invention of "improvements in steam boilers." 
1872. Patent '3436. To James Weir, of Liverpool, in the county of Lancaster, Engineer, for the invention of "improvements in apparatus to be used as a safety valve, or in connection with other safety valves."' 
1873 Moved to Glasgow. They designed and patented boiler-feed auxiliaries for both land and marine service.
1874 The hydrokineter used nozzle injectors to promote circulation in ship engine boilers.
Between 1880 and 1886, James made (and patented) 3 major inventions - a device to use excess steam to heat feed water and remove air and lime; a pump for hot feed water; an evaporator for distilling sea water. All of these inventions remained in use for many decades
1886 G. and J. Weir was set up the Holm foundry at Cathcart
1888 Glasgow Exhibition. Showed feed heaters, condensers and evaporators. Also an automatic feed and blow-off. 
1895 The partnership was dissolved, to be replaced by a private company G. and J. Weir Ltd of Cathcart, Renfrewshire. George sold his shares and left the company. Capital was £60,000 in £10 shares.
1900 Issued catalogue of marine feed-water heaters, feed pumps of many kinds, sea water evaporators, marine distillers and air pumps. 
1910 James Weir retired as chairman.
1914 Engineers. Specialities: marine auxiliary machinery, feed pumps, service pumps, independent air pumps, evaporators, surface condensers. 
1924 Advert says they supply marine auxiliaries for steam and diesel engine ships including all types of pumps. 
1930 Acquired Contraflo Condenser and Kinetic Air Pump Co
1933 Acquired A. G. Mumford
1937 Engineers and founders. 
1937 The Weir engine was designed for use in the Weir Autogiro (and other light aircraft). 2,000 cc air-cooled, inverted, underhead camshaft engine of 45 hp. It was being prepared for a type test.
1940 Advert. Pumps. 
1945 Advert. Boiler feed pumps; feeder heaters; de-aerators; distilling plants; feed regulators; air pumps; air compressors. 
1946 Boiler feed pump. Exhibit at Bradford Industrial Museum
1958 G. and J. Weir and Catton and Co combined their (steel and non-ferrous metal) foundry operations in a new company Weir-Catton which would acquire Cattons and Argus foundry from Weirs; the name of Argus foundry was changed to Weir Foundries
1959 G. and J. Weir Holdings became just a holding company of which G. and J. Weir was a subsidiary; held 50 percent interest in foundry company Weir-Catton which had 2 operating subsidiaries: Weir Foundries Ltd, and Catton and Co Ltd of Leeds.
1960 Advert. Boiler feed pumps.