Tremolant
an organ and harmonium stop which causes the air as it proceeds to the pipes or reeds to pass through a valve having a movable top, tached. The up-and-down movement of to which a spring and weight are atto which a spring and weight are atthe top of the valve gives a vibratory movement to the air, which similarly affects the sound produced. On American organs, a fan-wheel by rotating in molo. front of the wind chest causes a tre- Boston, Mass., was known. It arose from