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Plymouth Motor Fair

Source July 1941 Popular Mechanics Magazine
How automobiles are made is revealed by a working scale model which is a feature of the Plymouth Motor Fair now touring the United States. The model shows assembly-line work which results in the apparent production of cars 2 1/2 inches long. Eight mammoth trailers house the Plymouth exposition. In one of them is a complete movie projection booth for three-dimensional pictures in technicolor. Others transport the "big tops" and canvas crews, a "talking Plymouth" and other paraphernalia. The traveling show also includes a power house on wheels which generates all the electricity for the exhibits.
Generators coupled direct to the crankshafts of two Chrysler Diesel engines supply current for numerous electrical displays in the two big circus tents and three huge searchlights.