Herbert Philipp examining a high vacuum tube used in measuring the photoelectric emission from germanium crystals.
Monday, February 20, 2023, 8:30 pm EST
University of Pennsylvania
Monday, February 20, 2023, 10:00 am EST
Friday, February 17, 2023, 12:00 pm EST
Friday, February 17, 2023, 12:00 pm EST
Friday, February 17, 2023, 10:00 am EST
Friday, February 17, 2023, 12:00 am EST
Library Company of Philadelphia
Thursday, February 16, 2023, 5:00 pm EST
Cedars-Sinai Medical Center
Thursday, February 16, 2023, 11:30 am EST
Wednesday, February 15, 2023, 11:30 pm EST
College of Physicians of Philadelphia
Wednesday, February 15, 2023, 8:00 pm EST
American Philosophical Society
© 2026 Consortium for History of Science, Technology and Medicine | Copyright Infringement