1. Any electrically-operated piano (as opposed to a foot-pumped or hand-cranked piano). 2. Coin-operated piano, or coin piano. Term widely used by coin piano makers during the early 20th century. * Synonym: nickelodeon (modern usage; See nickelodeon). 3. A hand-played piano with electronic amplification of the tone-producing mechanism. Term used from the 1940s through the 1980s, when this type of electric piano was replaced by electronically-synthesized piano.

At triangular tab at the very beginning of a music roll, usually made of glue-backed cloth, to which an eyelet or hook is affixed for attaching the roll to the take-up spool.

The brass plates which seal the cement in the brass cylinder of a musical box adding rigidity to the cylinder and providing the precise bearing surfaces which support the cylinder on the arbor and allow it to slide as the tunes are changed.

Roll type made by gluing the beginning and end of a roll together to form a continuous loop. As the roll passes over the tracker bar it is fed into a storage bin. Advantages: 1. The roll passes over the tracker bar at a constant speed, so no tempo compensation is needed from one part of the same roll to another part. 2. The mechanism is simpler as no rewind/play mechanisms are needed. 3. The music is continuous, with no silent pause for rewinding. Disadvantages: 1. Rolls take several minutes or more to change. 2. Rolls are easily damaged during the changing process. 3. A large amount of space is needed for the roll storage bin in the piano. 4. It is impossible to select tunes by a fast forward or reverse mechanism. Endless rolls were mainly popular during the 1900-1910 decade, although some manufacturers (such as Link and the North Tonawanda Musical Instrument Works) used them in later years. Contrast with: rewind roll.

Part of the governor assembly in a clockwork mechanism. It is the worm or helicoidally (spirally) – cut shaft to which the airbrake is attached. The airbrake fan at the top regulates the speed of the mechanism.