A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It has a bellows, and buttons typically on both ends of it. When pressed, the buttons travel in the same direction as the bellows, unlike accordion buttons, which travel perpendicularly to the bellows.
Improvements in Anglo-German Concertinas (1884)
by George Jones
British Patent No. 9314 of 1884, 23 June 1884 with two figures. 2 pages.
Jones describes a 42-key Anglo concertina, which is a fully chromatic Anglo “ to enable the performer to play music in every key”, based on the older diatonic 10-key and 20-key German models.