Spherical specimen: view of cylinder (concrete with reinforcing steel tube) specimen with label SP-1 and outstretched ruler in foreground; cylinder appears to measure about 16 or 17 inches in diameter, no date

Spherical specimen: view of cylinder (concrete with reinforcing steel tube) specimen with label SP-1 and outstretched ruler in foreground; cylinder appears to measure about 16 or 17 inches in diameter, no date, Folder: 28.2; Item: 540; 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/70945 Accessed May 19, 2026.