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Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(perhaps from rigabello, an instrument used prior to the organ in the churches of Italy), a small portable finger-organ in use in the 16th and 17th centuries, and perhaps earlier. Many representations exist of this instrument, including one sculptured on Melrose Abbey. The tubes rested on the air-chest, which was filled by the bellows; and the bellows were managed with one hand, and the keys with the other.
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McClintock, John. Strong, James. Entry for 'Regals'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/r/regals.html. Harper & Brothers. New York. 1870.