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David Marr Henderson, Engineer-in-Chief, Imperial Maritime Customs of China, Engineers Office, Shanghai
Born the son of John Henderson
Studied engineering at the Queens College, Birmingham
Became a pupil of Fox, Henderson and Co of the London Works
Several years with the Chance Brothers
Joined P. D. Bennett of Spon Lane, Birmingham
1869 Engineer-in-Chief, Imperial Maritime Customs Service of China, Shanghai, China.
1869 Designed an 'apparent light', for shipping. 
1880 Wrote in The Engineer about 'Dioptric Apparatus in Lighthouses for the Electric Light'.