Melodeon (Gr. . , melody), the name, at different times, of two or more unlike forms of musical instruments, but now appropriated to one of recent date, and so far excelling those before it as to be substantially a new invention. In this, externally resembling the piano, the tones are produced by touching the keys of a tinger-board; each key, lifting a valve, allows a current of air from a bellows, worked meanwhile by the foot on a pedal, to agitate the corresponding one of a series of metallic free reeds; the compass is five to seven octaves. The rocking melodeon, known in America since about 1825, was unsightly, tardy in sounding, and of harsh tone. Jeremiah Carhart improved the plan of acting on the reeds by suction instead of blowing, and introduced other improvements, inventing the present instrument in 1836. The art of voicing the reeds, the most important improvement in such instruments, was invented by Emmons Hamlin in 1848. (See Reed Instruments.) In 1859, 22,000 melodeons were manufactured in the United States. But few are now made, this instrument having been almost entirely superseded by the cabinet or parlor organ, nearly 30,000 of which were manufactured in the United States in 1872.