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Thomas John Hamilton Fitzmaurice, Earl of Orkney (1803-1877)
1839 Earl of Orkney of Taplow Court, became a member of the Institution of Civil Engineers.
1862 Exhibited a rotary engine
1877 Obituary 
THE RIGHT HON. THOMAS JOHN HAMILTON FITZMAURICE, EARL OF ORKNEY, Viscount Kirkwall, and Baron Dechmont, CO. Linlithgow, in the peerage of Scotland, was born on the 18th of August, 1803, and he died on the 16th of May, 1877.
He was elected an Associate of the Institution on the 14th of May, 1839, “Because of his intimate acquaintance with machinery, and his being a great encourager of the mechanical arts generally.”