Orchestrion
A mechanical organ designed to imitate, by means of various stops, the instruments of the orchestra.
Ordinario (It.) (or-dee-nah'-ree-o).
Usual; ordinary; as tempo ordinario, the usual time, used in the sense of moderate.
Organ, Organo (It.), Orgue (Fr.), Orgel (Ger.) [from Gr., organon, tool, implement, instrument]. An instrument consisting of a large number of pipes grouped according to their pitch and quality of tone into " stops."
A large bellows supplies the compressed air or "wind" to the various air-tight boxes called sound-boards, on which the pipes are placed. By means of a key mechanism the "wind" is allowed to enter the pipes corresponding to any given pitch at will. The set or sets of pipes it is desired to sound are controlled by means of "registers" which, when drawn, allow the "wind" to enter the pipes of the "stop," the name of which is marked on the knob of the register. Organs are built with from one to four, and even more, " manuals," or keyboards, placed one above the other.
Three manuals is the usual number. The lowest is called the "choir organ," the middle the "great organ," the upper the "swell organ." When a fourth manual is added it is called the "solo manual," a fifth the "echo organ;" there is also a keyboard for the feet called the "pedal organ." Organ Point, Point d'orgue (Fr.), Orgelpunkt (Ger.). A succession of harmonies belonging to the key, written over a prolonged holding of the dominant or tonic, or both; an organ point is generally at the bass.