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This 1609 organ shows the short, button-style pedals of early pedal setups. By the beginning of the 17th century, organ designers began to give pedalboards on large organs a larger range, encompassing twenty-eight to thirty notes. As well, German organ designers began to use longer, narrower pedals, with a wider space between the pedals.
By this method, body diagrams can be derived by pasting organs into one of the "plain" body images shown below. This method requires a graphics editor that can handle transparent images, in order to avoid white squares around the organs when pasting onto the body image. Pictures of organs are found on the project's main page. These were ...
Tracker action in Jørlunde church.Organ by Frobenius (2009). 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. [1]
By this method, body diagrams can be derived by pasting organs into one of the "plain" body images shown below. This method requires a graphics editor that can handle transparent images, in order to avoid white squares around the organs when pasting onto the body image. Pictures of organs are found on the project's main page. These were ...
On a mechanical-action organ, a coupler may connect one division's manual directly to the other, actually moving the keys of the first manual when the second is played. Some organs feature a device to add the octave above or below what is being played by the fingers. The "super-octave" adds the octave above, the "sub-octave" the octave below. [1]
In a large organ with perhaps fifteen ranks in a division, this means that the organist may be moving upwards of sixty cone valves at any time in a four-part texture. Many organs with cone valve chests make use of pneumatic assist devices such as the Barker lever to reduce the perceived weight of the keys.
An organ with electro-pneumatic action or direct electric action has the lightness of touch of a tubular-pneumatic organ, but a faster response, and the console can be in any remote location. The console can also be movable, with only a cable connecting it to the rest of the organ. By the 1920s, tubular-pneumatic organs were rarely built.
The organs were designed to mimic the musical capabilities of a typical human band. For this reason they are known as band organs in the United States. The motive force for a fairground organ is typically wind under pressure generated from mechanically powered bellows in the instrument's base.