Philadelphia Central High School for Boys and Pennsylvania State Arsenal, 1839. This daguerreotype, created by Joseph Saxton, is the oldest known photograph taken in the United States. Image courtesy of the Historical Society of Pennsylvania.
Thursday, November 8, 2007, 8:30 pm EST
Drexel University
Thursday, November 8, 2007, 7:40 pm EST
American Philosophical Society
Wednesday, November 7, 2007, 3:35 pm EST
Penn Humanities Forum, University of Pennsylvania
Tuesday, November 6, 2007, 5:00 pm EST
Chemical Heritage Foundation, Brown Bag Lecture
Monday, November 5, 2007, 8:54 pm EST
Department of History and Sociology of Science, University of Pennsylvania
Monday, November 5, 2007, 5:54 pm EST
Department of History and Sociology of Science, University of Pennsylvania
Friday, November 2, 2007, 8:45 pm EDT
Philadelphia Area Center for History of Science
Wednesday, October 31, 2007, 5:46 pm EDT
Barbara Bates Center for the Study of the History of Nursing, University of Pennsylvania
Tuesday, October 30, 2007, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Monday, October 29, 2007, 8:52 pm EDT
Department of History and Sociology of Science, University of Pennsylvania
© 2026 Consortium for History of Science, Technology and Medicine | Copyright Infringement