Original sentence: A calliope is a musical instrument that produces sound by sending steam through whistles, originally locomotive whistles.A calliope is typically very loud; even small calliopes produce sound that can travel for miles.It was often played on riverboats and in circuses, where it was sometimes mounted on a carved, painted and gilded horse-drawn wagon in a circus parade (picture, right).The calliope is also known as a "steam organ" or "steam piano".The instrument's name originates from Greek mythology: Calliope (), daughter of Zeus, was chief of the Muses and mother of Orpheus
Edited sentence: A calliope is a musical instrument that produces sound by sending a gas, originally steam or more recently compressed air, through large whistles, originally locomotive whistles.A calliope is typically very loud; even some small calliopes produce sound that can travel for miles.Calliopes can be played by a player at a keyboard, or mechanically, either by a drum similar to a music box drum, or by a roll similar to a player piano.Circus calliopes were sometimes installed in steam-drive carousels, or alternatively mounted on a carved, painted and gilded wagon at the rear of a circus parade (picture, right).Riverboats, supplied by steam from the propulsion boilers.Some instruments have provision for both keyboard and mechanical operation.The air-driven calliope is some times called a calliophone, the name given it by its inventor.The main uses of the steam calliope were:.The name originates from Greek mythology: Calliope (), daughter of Zeus, was chief of the Muses and mother of Orpheus.The pronunciation of the instrument name varies.The steam calliope is also known as a steam organ or steam piano.The whistles of a calliope are tuned to a chromatic scale, and may number from 26 to 67, but 32 is traditional for a steam calliope.These wagons could be pulled by horses or by a steam-driven traction engine, the latter also on occasions supplying the steam