Compressed air gramophone

A compressed air gramophone is a kind of old-fashioned music player. It takes special records that look like flat disks and when you put them on the machine a needle reads the bumps and grooves on the record and makes a sound. Inside the gramophone is a machine powered by compressed air. When you turn the gramophone on, compressed air enters the machine and uses the air to make music. The air pushes the needles up and down to make the sound, like when you run your finger around the rim of a cup!