Perforation: Meaning (information, definition, explanation, facts)
On this page about Perforation:
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- Automation (19)
- Postage stamps (19)
Encyclopedia: Perforation
A perforation is a hole made by puncturing a surface. However, the term frequently refers to the practice of creating a long series of holes so that paper can be torn more easily. Postage stamps are one common application of this, where small round holes are cut in lines to create individual pieces (see postage stamp separation). Since the creation of perforation devices in the 1840s and 1850s, it has seen use in several areas. It is common for notebooks and legal pads to have perforations making it easier to tear out individual pages. Perforations on stamps are rather large, on the order of a millimeter, in comparison with other perforated materials often have smaller holes. Film stock is perforated to allow it to be moved precise distances at a time continuously. Screwcaps on glass or plastic bottles are sealed with a ring at the bottom of the cap attached by perforation. Twisting the cap has the effect of rupturing the perforation and indicating that the original seal has been broken.
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How to say "Perforation" in other languages:
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(German) | Perforation |
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Perfin is a contraction of 'Perforated Initials'. Organizations would use a perforator to create perforations forming letters or designs in postage stamps with the purpose of preventing pilferage. Formerly considered to be damaged, postage stamps so perforated are now highly sought by specialist...
The Land of Muggy is a Artistamp issuing authority. This is a fantasy land. The stamps are single colour, perforated and available for purchase...
9,5 mm film is an original amateur film format introduced with the Pathé Frères Pathé Baby. The format uses a single central perforation (sprocket hole) between each pair of frames, as opposed to 8mm film which has perforations along one edge...
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French drain refers to a ditch filled with gravel, rock or perforated pipe that redirects surface... perforated pipe surrounded by sand or gravel and landscaping materials. Landscaping materials are used to prevent dirt and roots from entering the drainage pipe. The perforated pipe allows for more...
from each other. Methods of separation include: perforation - cutting rows and columns of small..., Henry Archer patented a "stroke process" for the perforation of stamps, and in 1854 a "rotary... the perforator is the spacing of the holes; if too far apart, the stamps will not separate easily...
which is usually an indication of bowel perforation...
The method of perforated sheets was a codebreaking technique used against the Enigma machine (see Cryptanalysis of the Enigma). The method involved superimposing a series of sheets — each... key), obsoleting the attack based on perforated sheets...
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The Archaeocyatha are sessile conical animals that resemble hollow horn corals found in Lower Cambrian sediments. The structure is something like a pair of perforated, nested ice cream cones. Many modern authors treat them as Porifera (sponges). Archaeocyathans were important reef builders in...
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