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Thomas Brown (1812-1887)
1847 Published with Professor Thomas J. Main the "The Marine Steam Engine," which long remained the text-book for the Navy.
1888 Obituary 
THOMAS BROWN was born in 1812.
He commenced his career as a pupil for five years to Mr. Simon Goodrich, Engineer and Machinist to the Navy Board, and subsequently served for ten years on various stations as an Engineer afloat in the Royal Navy.
He became Chief Engineer in 1847, and in 1863 was promoted to the rank of Inspector of Machinery.
He retired from active service in December 1869. With the exception of the ten years he was afloat, he was, for the whole period of his connection with the Navy, instructor in steam and the steam-engine at the Royal Naval College at Portsmouth, and he was joint author of “Main and Brown on the Marine Steam-engine,” one of the earliest treatises on the subject, and for long a text-book at the Royal Naval Schools.
Mr. Brown was elected an Associate on the 6th of March 1860, and on the creation of the class of Associate Member in December 1878 was transferred to that grade. He died in August 1887.