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of Bow Lane Ironworks, Blackburn, and Soho Foundry, Preston, Lancs
1860 Company established by Joseph Foster
1877 Bow Lane Ironworks were built.
1886 Soho Foundry of Preston was bought (presumably Joseph Clayton and Sons?)
1889 Works leased at 20 Whitefriars Street, London.
1914 Engineers and manufacturers of printing machines. Specialities: book and newspaper printing and folding machines of all kinds, steam engines, boilers, mining machinery, chemical machinery and general engineering. Employees 700. 
1930 'HUGE CASTING. BLACKBURN FIRM'S SUCCESSFUL START ON DIFFICULT TASK.
Blackburn has just turned out its largest casting through Messrs. Joseph Foster and Sons, Canal Foundry, successors to Messrs. Yates and Thom. It was the first of four quarter segments cast for the rotor of huge electric generator being built by the British Electric Co. Preston for a well-known British steel firm.
The four segments together weigh about 115 tons. For the first segment the workmen used three large ladles, two containing over 16 tons of molten iron, and the third about six tons. The delicate operation was carried out in two minutes without hitch.
The order for the rotor was placed a fortnight ago and a guarantee of quick delivery was the means of bringing the order to Blackburn. Over 400 men are now employed at Canal Foundry on home and foreign orders, and on this work the firm will be fully engaged for four or five months.