Ellis, Original Letters Illustrative of English History (London, 1825-1846).
Ellis used this indication to have an organ pipe made which with one-sixteenth diameter and a wind-pressure of 34 in., at one-fourth Schlick's length, gave f' 301.6, from which he derived a just major third of a' 377, which would compare very well with an old Greek a'.
Dr Ellis had pipes (now preserved in the Royal Institution, London) made to reproduce both these pitches at 31 in.
Ellis used mean-tone temperament in calculating this lower pitch; but as he used just intonation for the Halberstadt, it seems preferable to substitute it for the Chorton, thus reducing it to a' 422.8.
Ellis offered the suggestion of a much higher pitch for this Cammerton in his lecture "On the History of Musical Pitch," read before the Society of Arts, London (Journ.
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