ZCG, Payload Specialist Al Sacco loads middeck experiment

STS073-353-018 (20 October - 5 November 1995) --- Payload specialist Albert Sacco Jr. inspects a crystal in a cylindrical autoclave on the middeck of the Earth-orbiting Space Shuttle Columbia. This Zeolite Crystal Growth (ZCG) experiment was one of a few U.S. Microgravity Laboratory (USML-2) experiments that were conducted in both the Shuttle proper and its primary cargo's science module in the payload bay. Most of the experiments were conducted solely in the science module. Sacco was one of two guest researchers who joined five NASA astronauts for 16 days of Earth-orbit research in support of USML-2.