The Clarkson family was wealthy from stock investments and real estate holdings, but required all of the sons to learn a trade, so Clarkson and his brother Levinus operated the family's farm until Levinus' death. At this time, Clarkson engaged in other business endeavors in
Potsdam, New York including developing local electrical power plants and the first sewer system in the area and operating large sandstone quarries on the
Raquette River in 1877. Clarkson and a cousin founded the Potsdam Public Library and Reading Room and a tuition-free night school teaching mechanical drawing. Clarkson made a large donation to
Trinity Episcopal Church in Potsdam in honor of his father.
Death Clarkson was accidentally killed while working in his sandstone
quarry not far from Potsdam. When a worker was in danger of being crushed by a loose pump, Clarkson pushed him out of the way risking his own life. Clarkson was crushed against a wall by the swinging pump, sustaining severe internal injuries. He died five days later. The Clarkson family realized great wealth in the development of such quarries, and Potsdam sandstone was highly sought after by developers of
townhouses in
New York City and elsewhere. The family were important benefactors in the Potsdam area. After his death, Clarkson's three sisters decided to fund a school, which would be named after their brother. The school was founded in 1896 and was called the
Thomas S. Clarkson Memorial School of Technology before it later became
Clarkson University. Upon his niece, Annie Clarkson's, death in 1929, she made the college her chief beneficiary. ==References==