From Thomas Jefferson Encyclopedia
Caleb Lownes, a Philadelphia Quaker, was an iron merchant who supplied Thomas Jefferson with iron for his nailery. Lownes also served as a member of the Board of Inspectors of the Pennsylvania state penitentiary from 1790-1799, and served as secretary of the Philadelphia Committee, which organized the city's resistance to the yellow fever plague of 1793.
- Betts, Farm Book, 426-429.
- DePuy, LeRoy. "The Walnut Street Prison: Pennsylvania's First Penitentiary," Pennsylvania History 38(1951): 130-144.