Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,739 pages of information and 211,890 images on early companies, their products and the people who designed and built them.
1855 Partnership dissolved between George Holcroft and William Jennings Hoyle, of Manchester, consulting engineers and mill architects, 18th Dec. Debts by Holcroft. 
1857 Working as Manager of Richard Armitage's Upper Aspley Mill, Huddersfield
1862 'William Jennings Hoyle, engineer, and John Proven, millwright, both of Halifax, for improvements in mechanism and arrangements for supplying lubricating matter to the cylinder of steam engine and to the bearings and also for other surfaces of mechanism. Dated August 19, 1862.
1885 Provisional Patent Specification Accepted: William Jennings Hoyle, Elswick Works, Newcastle-on-Tyne, for Improvements in Carriages for heavy ordnance for land defences. 
1887 Died at 6 Bentinck Villas, Newcastle, 14th March, age 67