Abstract: A display device for generating bubbles, which may be illuminated, passing through a body of fluid, including a sealed translucent hollow glass tube partially filled with fluid of a low boiling point and evacuated of air, a chamber of a diameter less than that of the tube secured to the bottom end of the tube, and a heat source associated with the chamber. In one embodiment of the invention the chamber consists of a mass of agglomerated prismatic particles bonded to the bottom of the tube. In another embodiment of the invention, the chamber consists of a closed glass tube having a heater therein which is open on one end for discharge of bubbles into the sealed tube. The invention also includes the method for making such a bubbler device.