Testing specimen: View of ten concrete columns lined up in a row displaying varying degrees of damage; labeled BT-5, BC-5, BT-4, BC-4, BT-3, BC-3, BT-2, BC-2, BT-1, BC-1; chalkboard with notes can be seen in the background, 1960

Testing specimen: View of ten concrete columns lined up in a row displaying varying degrees of damage; labeled BT-5, BC-5, BT-4, BC-4, BT-3, BC-3, BT-2, BC-2, BT-1, BC-1; chalkboard with notes can be seen in the background, 1960, Item: 4842; Folder: 27.2; Box: 7. Negatives and Photographs of Fritz Engineering Laboratory Tests and Events, SC Photo 0013. Lehigh University Grant Projects. https://archivesspace.lib.lehigh.edu//repositories/7/archival_objects/75808 Accessed May 19, 2026.