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The accordina or a short history of wind accordions
Episode 04 – Harmonicor – L. J. Jaulin, 1861
Harmoni-cor
Named new oboe, the harmoni-cor of Louis Julien JAULIN (France) was intended to be a substitute for the oboe or the English horn in the orchestra!With twenty-five pistons, the chromatic instrument is organised with white and black keys for the semitones, in the manner of a piano keyboard.
Illustration: In Guide pratique des sociétés musicales et des chefs de musique, by E. Guilbaut.