Philippe, I don't think that's correct. There are blades in the drum, they are around the circumference, and you can see one in the sixth picture (on the left, visible through the opening). I would have to guess that the washtub revolves back & forth, and those blades set up some kind of agitation. Probably a turbulent whirlpool action rather than a toroidal flow.
Very interesting design. Almost a precursor to the modern automatics, in the sense of using one tub for wash, rinse, and spin; and I wonder what the spin speed is.
The exposed motor is a possible safety risk, so whoever buys this should run it through a GFCI outlet.
Re. Savage Arms: In those days, hunting was more important in obtaining the family's food supply. So you come home from a weekend of tramping about in the woods and the swamps, put your Savage rifle up on the rack above the fireplace, and throw your sweaty & dirty hunting clothes into the Savage washer...? Now if they also made ovens, stoves, and cookpots, I suppose you could toss a duck in the Savage oven and then put the leftovers into the Savage soup pot!
BTW, if I recall correctly. the word "savage" is an Englishized version of the word "sauvage" (accent-mark above the second "a") which roughly means "of the woods." So that would fit pretty well.