This jar is similar to the Revigator in a couple of obvious ways:  the insides of the jars are lined with a porous yellowish uranium ore, and the color of the ceramics is a light tan. The only real difference is their shape. The most common type of Revigator looks something like a cooling tower while this jar is shaped like a barrel. It even has raised bands simulating a barrel's metal hoops. The lid, alas, is missing in this example.

It was obviously intended to be filled with water, just like the Revigator, so that the water would be charged with radon and then consumed. 

The text on the front of the jar reads: Thomas Radium C.R. Patented 7, 16, 12 other pat's pdg.  "Thomas" possibly refers to the man credited with inventing the Revigator: R.W. Thomas. I am not sure of the meaning of the "C.R." The patent date (7, 16, 12) refers to U.S. Patent 1,032,951 taken out by Curt Schmidt in which he described the construction of such jars in very general terms. 

Although I have no direct evidence to support the idea that the Thomas Radium CR jar was the forerunner of the Revigator, and produced by what later became the Radium Ore Revigator Company, I have no doubt that this is the case. For a description of a "missing link" Revigator jar that is identical to the straight sided version of the Thomas Radium CR jar, click here.

Size:  ca. 15" tall, 12" maximum diameter

Exposure Rate:  ca. 20 uR/hr above background at one foot