Children pump the exposed plunger and the central portion of the top spins and plays music. The faster the children press the plunger, the faster the top will spin, and the faster the music will play.
The toy's underlying physical principle is a gyroscope. When the plunger is pressed, an internal weight starts to spin, causing the metal body of the top to spin also. Music is imprinted on the edge of the weight and a steel comb attached to the inside of the metal body plays the music as the top spins. This is similar to devices inside music boxes or player pianos.
The top will be made of aluminum and will be painted different colors to appeal to children. It will be inexpensive (but more expensive than the preceding example) to construct because gyroscopes are readily available. The majority of the cost comes from constructing the aluminum shell of the top, and imprinting the music on the internal weight. The toy is stationary so will not be subject to damage caused by transport. The aluminum body of the shell will withstand scratches and minor dents. The steel comb that plays the music imprinted on the internal weight may break, or become loose after repeated use. The toy is a single assemblage, so there are no choking hazards and no risk of loose pieces flying off at high speeds.
