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The pipe organ is a musical instrument that produces sound by driving pressurized air through the organ pipes selected from a keyboard. Because each pipe produces a single pitch, the pipes are provided in sets called ranks, each of which has a common timbre and volume throughout the keyboard compass. Most organs have many ranks of pipes of differing timbre, pitch, and volume that the player can employ singly or in combination through the use of controls called stops.
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A theatre organ is a type of pipe organ developed to accompany silent films, from the 1900s to the 1920s.
Tracker action is a term used in reference to pipe organs and steam calliopes to indicate a mechanical linkage between keys or pedals pressed by the organist and the valve that allows air to flow into pipe(s) of the corresponding note. This is in contrast to "direct electric action" and "electro-pneumatic action", which connect the key to the valve through an electrical link or an electrically assisted pneumatic system respectively, or "tubular-pneumatic action" which utilizes a change of pressure within lead tubing which connects the key to the valve pneumatic.
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"Tubular-pneumatic action" refers to an apparatus used in many pipe organs built during the late 19th and early 20th centuries. The term "tubular" refers to the extensive use of lead tubing to connect the organ's console to the valves that control the delivery of "wind" to the organ's pipes. Many such organs are extant 100 or more years after their construction.
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References
- ↑ "OHS Pipe Organ Database". pipeorgandatabase.org.
- 1 2 Ochse, Orpha (1975). The history of the organ in the United States . Bloomington: Indiana University Press. ISBN 0253328306. OCLC 1007842.
- ↑ Landon, John W. (1983). Behold the mighty Wurlitzer : the history of the theatre pipe organ. Westport, Conn.: Greenwood Press. ISBN 0313238278. OCLC 9412256.