Metal organ pipe of special construction, often about 1 1/2" in length, with an extension of the open end immersed in a container of oil or glycerin, causing the pitch to warble in imitation of a canary. Used in certain theatre organs and photoplayers for sound effects, and rarely in orchestrions, such as the Capitol Bluebird Orchestra, for novelty purposes.

Usually a tiny bird automaton in a decorated metal, tortoise shell or composition case. The bird pops up from under a spring-loaded lid, moves its wings and, on the higher quality, early models, the head. A bird song is produced from a bellows-operated flute or whistle within the box.

Also includes birds enclosed in a cage and/or fixed on a perch that may or may not move but make whistling/birdlike sounds and do not pop out of a box.

Usually in a tracker scale, a hole or key that is not connected and/or serves no purpose. In some scales blank holes or keys were included to provide for additional pipe ranks or other effects which might be added in the future. In other scales, a blank space represents a function originally planned but never used, or a function which was discontinued from an earlier scale layout.

A restrictive orifice, accomplishing the same function as a tiny hole in a pouch, allowing air pressure to be equalized on both sides of the pouch so it may return to its "off" position when a tracker bar hole is closed or an actuating valve is turned off. * Synonym: vent.

In some band organs, trombone (large, bright-sounding bass reed pipes). In others, a separate more mellow rank of bass reed pipes. In a pipe organ, a reed rank brighter than the fagotto but not as brassy as a trombone.