1. Memoir of Henry Augustus Rowland;Mendenhall;Biographical Memoirs, National Academy of Sciences,1903
2. The Rittenhouse Diffraction Grating;Cope;Journal, Franklin Institute,1932
3. Light;Herschel,1830
4. Memorial of Facts Connected with the History of Medallic Engraving and the Process of M. Collas;Nolte,1838
5. A Ruling Engine used by John Barton, and its Products;Grodzinski;Transactions, Newcomen Society,1948