The only "props" that "dry ice" needs for its act are a number of metal, plates of different thickness. The change from "frozen snow" to gas is accelerated when contact is made with a conductor of heat, such as a metal plate. Millions of small puffs of gas press against the plate, causing it to vibrate, and to emit a Pure musical note depending on the nature and thickness of the metal.
A most convincing rendering of "God Save the King" was given in this way!
Viewers also watched the striking effect of sprinkling sand on the metal plates, and then touching them with a small stick of "dry ice" The vibrations set up shook the sand into beautiful symmetrical patterns of infinite variety, which could be set in wax, and Which, as the demon-strafer suggested, might be used as an aid to designing on textiles and the like, Finally, by way of an encore, "dry proceeded to "make money A penny squealed most piteously when placed on one of these polar blocks!
Text read from the printed page and cleaned; old type leaves the occasional error.