What is Believed to be the Total World Supply of Radium.

Estimated at 140 Grams, or 5 Ounces.
The lower, White, portion of the Tube shows the total
amount of Radium produced by the Standard Chemical
Company of Pittsburgh.
The centre, dark portion shows the total portion of
the world supply, refined by other American Producers.
The top, white portion, shows the total estimated portion
 of the whole world supply, refined in Europe.
The telephone receiver and tube are placed together
in order to show relative dimensions and give an approximation
 of the volume of radium in the world.