Spherical specimen: post-test view of cylinder (concrete with reinforcing steel tube) specimen with label SP-2 and outstretched ruler in foreground; cylinder appears to measure about 12 or 13 inches in diameter; ragged hole in center of cylinder, no date

Spherical specimen: post-test view of cylinder (concrete with reinforcing steel tube) specimen with label SP-2 and outstretched ruler in foreground; cylinder appears to measure about 12 or 13 inches in diameter; ragged hole in center of cylinder, no date, Folder: 28.3; Item: 541; Box: 1. 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/70946 Accessed May 19, 2026.