heat of the bulb

The tube of liquid is what sets the bubble light into its own unique
category. The liquid is a special low-boiling point chemical sealed in a glass
vial which has had the air evacuated, allowing the liquid to boil from the
heat of the bulb, then condense once the bubbles have reached the top
of the liquid. This process is explicitly described in the patent flied June
9, 1945, by A. Abramson. “The liquid is of low boiling point and I may
employ fluids such as, for example, wood alcohol, ether, or methylene
chloride. If it is desired to enhance the ornamental effect, the liquid, tube,
or both may be colored or a thin film of pellucid coloring matter coated
on the inner or outer surfaces of the tube. Only a portion of the tube is
filled in liquid, the balance of the tube being evacuated so as to provide
a partial vacuum in which vapor (bubbles) generated in the lower end of
the tobe may condense and return to the body of the liquid.”

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