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1850 Born the son of Robinson Thwaites
1871 Living at 48 Horton Road, Horton, Bradford: Robinson Thwaites (age 64 born Bradford), Engineer and Tool Maker employing 130 men and 13 boys. With his wife Anna Thwaites (age 59 born Clayton) and their three sons; Thomas H. Thwaites (age 25 born Horton), Engineer and Tool Maker; William H. Thwaites (age 20 born Horton), Engineer and Tool Maker; and Albert E. Thwaites (age 6 born Horton).
1883 Obituary 
WILLIAM HENRY THWAITES was born at Bradford on 9th July 1850, and died at his residence in Bradford on 18th December 1882, at the age of thirty-two.
On the completion of his education he entered the Vulcan Iron Works, Bradford, then carried on by his father, Mr. Robinson Thwaites, and Mr. E. H. Carbutt, M.P., under the style of Thwaites and Carbutt. Here he acquired his business experience, and on lot August 1876 became a partner in the firm of Thwaites Brothers, which then took possession of the works; in this position he remained until the date of his decease.
He became a Member of the Institution in 1875.