 Early high speed photography equipment was developed for use with strobe lights to document the effect of projectile shape on entry stability in large glass sided tanks.During the 1950s, the increase in power use demanded expansion of generation capacity and led to increased use of physical models for solving problems with circulating water systems, including the use of hydro-thermal modeling to meet water quality requirements.This need resulted in the construction of 10 large test sheds to house these models.