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William Firth (1835-1892) of William Forth
1892 Obituary 
WILLIAM FIRTH was born at Leeds on 27th August 1835.
On leaving school he joined his father in his business of iron and steel merchant, which had been started about 1823 and gradually increased, chiefly in connection with local engineering firms and with collieries in various parts of England. In the latter he did much in recent years to introduce the use of rolled steel girders in the place of timber supports for the roof of mines; and also a pit prop formed from a steel girder.
He was also managing director of the Thornhill Iron and Steel Co., Dewsbury.
His death took place at Leeds on 12th November 1892, in the fifty-eighth year of his age.
He became a Member of this Institution in 1887.