the.com/concertina
an accordion that did pushups, squeezing melodies out of pure hexagonal stubbornness
inventedEngland, 1829, by physicist Charles Wheatstone
each buttonplays two notes, one per bellows direction
razor wirenamed concertina for its accordion-like coils
sailor staplecompact size made it the seafarer's instrument
Wheatstone alsoco-invented the telegraph and stereoscope