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Figure 7

Colour photograph of a Wheatstone concertina instrument fashioned in wood

Bosanquet's enharmonic harmonium, c1876. Enharmonic harmonium with 4 1/2 octaves tuned in 53 equal temperaments with 84 keys per octave, designed by R H M Bosanquet (1841–1912) of St John's College, Oxford, and constructed by T A Jennings of Hackney Road, London in 1872–3. Bosanquet's research into musical intervals and temperaments was influential in determining the design of keyboards for modern musical instruments.