This is a model B Rexair made in April, 1940. They named this model the "black diamond". Here she is sitting on the extremely rare, 2 gallon commercial water basin complete with wheels. The water basin came from the estate of the late Clay Floyd.
The "Rams horn" diaphragm. This brought the dirty air under the surface of the water, and caused a geyser effect as the air and water mixture was discharged from the end of the horn, toward the rotating separator. I don't know anyone else who has one.
A view from the front of this vintage beauty. The hose is 100% sealed. This machine came from the home of a doctor in Springfield, Illinois. The maid didn't like it. They quickly purchased an Electrolux, right before the war.
Pictured center is the standard metal water basin that came with the model B. Pictured left is the 4 quart water basin which was optional. Pictured right is the postwar plastic demonstration water basin.
The complete, 1940, commercial model B Rexair. One way to tell a pre-war model, is the fact that the upper clamps that hold the top cover, are secured with screws. That's because there is a post motor cloth filter under the cover, they called it the "muffler". This was discontinued after the war.