2.670 professor Douglas P. Hart adjusts Alison S. Greenlee's '09 Stirling engine just before the final spin-off on Friday, Feb. 2.

Eric D. Schmiedl—The Tech

2.670 professor Douglas P. Hart adjusts Alison S. Greenlee's '09 Stirling engine just before the final spin-off on Friday, Feb. 2. Eric D. Schmiedl—The Tech