1821-) developing a euharmonic, or enharmonic organ which they patented and solicited by mail, and which was awarded a gold medal at the 1850 Exhibition of the Massachusetts Charitable Mechanic Association.

The new scale replaced subdominant pitches with the "perfect seventh and ninth of the dominant harmony" to correspond better with what he heard harmonically and melodically in all kinds of music.

On the suggestion of Thomas Perronet Thompson Poole developed a special keyboard to compel a "musician to know what he is doing", although A. U. Hayter, the King's Chapel organist, had complained about the care required by the existing plan.

The staggered keyboard arrangement separated distant key signatures and aligned octaves and was transpositionally invariant but not generalized, although the abbreviated pedalboard implied 3, 5, and 7 axes for 14 key-notes using three ranks of identical key levers.Poole outlined methods to increase the versatility of similarly arranged instruments, including a slightly tempered 78-tone scale, and a 106-tone scale with two cycles of 53 equal temperament (a Bosanquet "multiple system").

On April 6, 1871 an enharmonic reed organ constructed by Joseph Alley using more uniformly shaped keys was demonstrated at a meeting of the Society of Arts in Boston by Edward C. Pickering, and played by Edwin H. Higley.