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.
Tuesday, November 6, 2012, 5:00 pm EST
Chemical Heritage Foundation, Brown Bag Lecture
Monday, November 5, 2012, 8:30 pm EST
Department of the History and Sociology of Science, University of Pennsylvania
Friday, November 2, 2012, 6:00 pm EDT
Hagley Museum and Library
Thursday, November 1, 2012, 8:00 pm EDT
Johns Hopkins Program in the History of Science, Medicine and Technology
Thursday, November 1, 2012, 4:45 pm EDT
Wednesday, October 31, 2012, 5:00 pm EDT
Barbara Bates Center, University of Pennsylvania
Tuesday, October 30, 2012, 11:30 pm EDT
College of Physicians of Philadelphia
Tuesday, October 30, 2012, 5:01 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Monday, October 29, 2012, 8:30 pm EDT
Department of the History and Sociology of Science, University of Pennsylvania
Thursday, October 25, 2012, 11:00 pm EDT
Philadelphia Area Seminar on the History of Mathematics, Villanova University
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