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Thomas William ( -1900)
His youngest son was also named Thomas William Lewis
Obituary 1900 
"...death of Mr. T. W. Lewis, C.E. father of Sir W. T. Lewis, Bart., and one of the oldest mechanical engineers of South Wales. At the age of twelve he was apprenticed as a mechanical engineer, or, as then called, a millwright, under Messrs. Hill, of Plymouth Works, went through the pattern shop, foundry, fitting shop, and drawing office, and on the death of the chief engineer was appointed to succeed him, though not then twenty-five years of age. For twenty years he had charge of the erection of various new rolling mills..."More.