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James David Forbes FRS FRSE FGS (20 April 1809 – 31 December 1868) was a Scottish physicist and glaciologist.
He worked extensively on the conduction of heat and seismology.
Forbes was a resident of Edinburgh for most of his life, educated at the University and a professor there from 1833 until he became principal of the United College of St. Andrews in 1859. He invented the seismometer in 1842. 
1869 Obituary