The weapon we use from adolescence
Posted October 2nd, 2013
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If Pen is mighter than the sword then the pencil is the mightiest. I believe that's the one that prepares us for pen and all other things of life, being our first external companion to express apart from out body parts. Let's find the story starting with the unsolved mystrey of claim, stating pencil being used first time today in 1492.


 


The "lead" pencil was invented in 1564 when a huge graphite (black carbon) mine was discovered in England. Lead pencils do not actually contain lead. Instead, they are a combination of graphite (a form of carbon) and clay. They were called lead pencils by mistake because, at the time, graphite looked like lead.


 


In the 1500s, a large graphite deposit was discovered in England and pencils came into common use.


Around 1560, an Italian couple named Simonio and Lyndiana Bernacotti made what are likely the firstblueprints for the modern, wood-encased carpentry pencil. It was called plumbago (Latin for "lead ore"). The black core of pencils is still referred to as lead, even though it never contained the element lead. The words for pencil in German (Bleistift)Irish (Peann Luaidhe), Arabic (قلم رصاص qalam raṣāṣ), and other languages literally mean lead pen.


 


The town of Keswick, near the original findings of block graphite, still manufactures pencils, the factory also being the location of the Cumberland pencil museum. The first attempt to manufacture graphite sticks from powdered graphite was in Nuremberg, Germany, in 1662. It used a mixture of graphite, sulphur, and antimony.


 


A grading chart ranging from 9B to 9H


"H" (for hardness) to "B" (for blackness), as well as "F", a letter arbitrarily chosen to indicate midway between HB and H.The standard writing pencil is graded HB. The ranges from hardest to softest as follows:


9H 8H 7H 6H 5H 4H 3H 2H H F HB B 2B 3B 4B 5B 6B 7B 8B 9B


Hardest → Medium → Softest


 


Pencils are commonly round, hexagonal, or sometimes triangular in section. Carpenters' pencils are typically oval or rectangular, so they cannot easily roll away during work.


 


Thomas Edison had his pencils specially made by Eagle Pencil. Each pencil was three inches long, was thicker than standard pencils and had softer graphite than was normally available.


 


Types


By marking material


Coloured pencils, Promotional pencils, Graphite pencils, Solid graphite pencils, Charcoal pencils,Carbon pencils


Coloured pencils or pencil crayons, Grease pencils, Watercolour pencils.


 


By use


Carpenter's pencils(The oldest surviving pencil is a German carpenter's pencil dating from the 17th Century and now in the Faber-Castell collection), Copying pencils (or indelible pencils), Erasable colour pencils, Non-reproducing, Stenographer's pencil, Golf pencil.


 


By shape


Triangular (more accurately a Reuleaux triangle), Hexagonal, Round, Bendable (flexible plastic)


By size


A standard, hexagonal, "#2 pencil" is cut to a hexagonal height of 1⁄4-inch (6 mm), but the outer diameter is slightly larger (about 9⁄32-inch (7 mm)) A standard, #2, hexagonal pencil is 19 cm (7.5 in) long.


 


Biggest Pencil in the world


On 3 September 2007, Ashrita Furman unveiled his giant US$20,000 pencil – 76 feet (23 m) long, 18,000 pounds (8,200 kg) (with over 4,500 pounds (2,000 kg) for the graphite centre) – after three weeks of creation in August 2007 as a birthday gift for teacher Sri Chinmoy. It is longer than the 65-foot (20 m) pencil outside the Malaysia HQ of stationers Faber-Castell.



Link:http://en.wikipedia.org/wiki/Pencilwww.pencilpages.com 


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