Gore (segment)
A gore is a sector of a curved surface [1] or the curved surface that lies between two close lines of longitude on a globe and may be flattened to a plane surface with little distortion. [2] The term has been extended to include similarly shaped pieces such as the panels of a hot-air balloon or parachute, [3] or the triangular insert that allows extra movement in a garment. [4]
Examples
- Spherical globes of the Earth and Celestial sphere were first mass-produced by Johannes Schöner using a process of printing map details on 12 paper gores that were cut out then pasted to a sphere. This process is still often used. The gores are conveniently made to each have a width of 30 degrees of longitude matching the principal meridians from the South Pole and North Pole to the Equator.
- Parachutes and hot air balloons are made from gores of lightweight material. The gores are cut from flat material, and stitched together to create various shapes.
- Corners in round duct-work can be created by welding or fixing gores of metal sheet to form a bend.
- Some designers use the stretched grid method to design gores that are cut out of weather-resistant fabric and then stitched together to form fabric structures.
References
- ^ Chambers English Dictionary (1988)
- ^ http://support.esri.com/en/knowledgebase/GISDictionary/term/gore
- ^ http://www.apexballoons.com/balloons/
- ^ http://www.renaissancetailor.com/demos_goresgussets.htm
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