In 1847, Eben Horsford was appointed to Harvard's Rumford Chair of the Application of Science to the Useful Arts. American-born physicist, Benjamin Thompson Rumford (1753-1814), later known as Count Rumford, left Harvard University the funds with which was founded the Rumford professorship, known as Rumford Chair of the Application of Science to the Useful Arts. It is not known if Eben Horsford named his company and baking powder after his chair at Harvard University or after Benjamin Thompson Rumford.
There were plants in serveral places. I know of one in providence RI and one in New Jersey.
Rumford Chemical was a Providence,RI company from 1852-1892 they made lots of baking soda and phosphate type compounds. Their teal colored bottles are very pretty but also fairly common, at least here in the northeast. Very nice window bottles.