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Gore (segment)

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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

Single-use American WW II aircraft impregnated paper drop tanks, the ends of which used gores of paper to form their curved shapes.
  • 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.
  • Pressure suit joints are often constructed of alternating gores and convolutes of material constrained by cables or straps along the sides of the joint, producing an accordion-like structure that flexes with nearly constant volume to minimize the mechanical work which must be done by the suit occupant.[5]
  • 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.
The gores of Waldseemüller's 1507 globe of the world, the first to use the name "America"

References

  1. ^ Chambers English Dictionary (1988)
  2. ^ "gore - GIS Dictionary". Support.esri.com. Retrieved 2013-09-08.
  3. ^ "Hot Air Balloon Manufacturer, Hot Air Airships, Balloon Repair Station". APEX Balloons. Retrieved 2013-09-08.
  4. ^ Tammie L. Dupuis. "Recreating 16th and 17th Century Clothing". The Renaissance Tailor. Retrieved 2013-09-08.
  5. ^ Harris, Gary L. (2001). The Origins and Technology of the Extravehicular Space Suit. San Diego: American Astronautical Society. pp. 1–89. ISBN 0-87703-482-6.
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