Washington’s National Theater quite recently gave up its rope-and-sandbags rigging system: it was one of the last of the “hemp houses.” Rebecca Cooper has the story for Washington Business Journal, and there is good video about the transition to the cables-and-counterweights system (less flexible, but standardized) that most hands know.
Going back a little farther in time, a documentary short from the 1950s shows IATSE Local 22 loading in the National’s touring show of My Fair Lady.