Concrete cylinder compression test, representative photograph
Representative materials-testing photograph, not the new Albany laboratory. <a href="https://commons.wikimedia.org/wiki/File:Concrete_Compression_Testing.jpg">Photo: Xb-70, courtesy of Simpson Gumpertz & Heger Inc.</a>; <a href="https://commons.wikimedia.org/wiki/Template:PD-self">released to the public domain by the creator</a>. No editorial alterations; display versions may be resized or cropped.
Representative materials-testing photograph, not the new Albany laboratory. Photo: Xb-70, courtesy of Simpson Gumpertz & Heger Inc.; released to the public domain by the creator. No editorial alterations; display versions may be resized or cropped. License evidence: Exact Commons file Concrete Compression Testing.jpg: creator Xb-70 explicitly releases work into public domain worldwide; courtesy of Simpson Gumpertz & Heger noted. Verified September 29, 2026. This is not the separate H. Mark Helfer copyrighted photograph.
