Thornton, William E. (William Edgar), 1929-2016-03-292016-03-291972http://hdl.handle.net/2152.3/617Photograph of an unnamed engineer testing the "SMMD" (Specimen Mass Measurement Device) that was used to gather measurements of the human body's response to weightlessness during the SMEAT Skylab simulations.Skylab Program.Space medicine.Space flight--Physiological effect.Weightlessness--Physiological effect.Image