|Source||ACHS. Patrick Coad Family Papers.|
|Topic||Electricity and magnetism.|
These materials are owned by the American Catholic Historical Society and maintained at the Philadelphia Archdiocesan Historical Research Center, 100 E. Wynnewood Rd. Wynnewood, PA 19096. For more information please see: http://www.pahrc.net. [1/2/10] Pages 5-8 of a manuscript about electrical fields, likely by Patrick Coad.