Compressed air gramophone

Compressed air gramophones were gramophones which employed compressed air and a pneumatic amplifier to amplify the recorded sound.

One of the earliest versions was the Auxetophone, designed by the British engineer Sir Charles Parsons. It was capable of producing sufficient volume to broadcast public music performances from the top of the Blackpool Tower, and was said to be loud enough to cause people to vacate the front rows of seats in an auditorium.