EraserFrom Wikipedia, the free encyclopedia

An eraser (US and Canada) or rubber (India, UK, Ireland, South Africa, Australia, New Zealand and

Canada) is an article of stationery that is used for removing pencil markings. Erasers have a rubbery

consistency and come in a variety of shapes, sizes and colours. Some pencils have an eraser on one end. Typical

erasers are made from synthetic rubber, but more expensive or specialized erasers are vinyl, plastic, or gum-like

materials. Cheaper erasers can be made out of synthetic soy-based gum.

History

Before rubber erasers, tablets of rubber or wax were used to erase lead or charcoal marks from paper. Bits of

rough stone such as sandstone or pumice were used to remove small errors from parchment or papyrus

documents written in ink. Crustless bread was used as an eraser in the past; a Meiji-era (1868-1912) Tokyo

student said: "Bread erasers were used in place of rubber erasers, and so they would give them to us with no

restriction on amount. So we thought nothing of taking these and eating a firm part to at least slightly satisfy our

hunger."[1]

In 1770, Edward Nairne, an English engineer, is credited with developing the first widely-marketed rubber

eraser for an inventions competition. Until that time the material was known as gum elastic or by its native

American name (via French) caoutchouc. Nairne sold natural rubber erasers for the high price of three shillings

per half-inch cube. According to Nairne, he inadvertently picked up a piece of rubber instead of breadcrumbs,

discovered rubber's erasing properties, and began selling rubber erasers. The invention was described by Joseph

Priestley on April 15, 1770, in a footnote: "I have seen a substance excellently adapted to the purpose of wiping

from paper the mark of black-lead-pencil. ... It is sold by Mr. Nairne, Mathematical Instrument-Maker, opposite

the Royal-Exchange."[2]

In 1770, the word rubber was in general use for any object used for rubbing.[3]

The

word became attached to the new material sometime between 1770 and 1778.[4]

However, raw rubber shared the same inconveniences as bread, since it was perishable. In 1839, inventor

Charles Goodyear discovered the process of vulcanization, a method that would cure rubber and make it a

durable material. Rubber erasers became common with this advent of vulcanization.

On March 30, 1858, Hymen Lipman of Philadelphia, USA, received the first patent for attaching an eraser to the

end of a pencil. It was later invalidated because it was determined to be simply a composite of two devices

rather than an entirely new product.[5]

Erasers may be rectangular blocks (block and wedge eraser), or conical caps that can slip onto the end of a

pencil (cap eraser). A barrel or click eraser is a device shaped like a pencil, but instead of being filled with

pencil lead, its barrel contains a retractable cylinder of eraser material (most commonly soft vinyl). Most of

modern American pencils were made with attached erasers. In Europe, Pencils without erasers were more

common.[6]

Novelty erasers, in a dual role as figurines (such as musical notes, animals, confectionery), are

mostly decorative, as their hard vinyl tends to smear heavy markings.

Types

Art gum erasers

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An eraser type that is popular with artists is the art gum eraser, made of soft, coarse rubber. It is especially

suited to removing large areas, and it does not damage paper. However, they are imprecise. Gum erasers tend

to crumble as they are used, so this type leaves a lot of eraser residue. This residue must then be brushed

away with care, as the eraser particles can leave marks on the paper. Many artists use a broad brush to sweep

away the loose eraser residue. Art gum erasers are commonly tan or brown, but sometimes are sold in blue.

Kneaded erasers

Kneaded erasers are common to most artists' standard toolkit. This type has numerous uses. They can be pulled

into a point for erasing small areas and tight detail erasing, molded into a textured surface and used like a

reverse stamp to give texture, or used in a "blotting" manner to lighten lines or shading without completely

erasing them. They gradually lose their efficacy and resilience as they become infused with particles picked up

from erasing and from their environment. They are weak at erasing large areas, as they deform under vigorous

erasing.

Poster putty

Commonly sold in retail outlets with school supplies and home improvement products, this soft, malleable putty

appears in many colors and under numerous brand names. Intended to adhere posters and prints to walls without

damaging the underlying paint, poster putty works much the same as traditional kneaded erasers, but with a

greater tack or lifting strength. Poster putty does not erase so much as lighten by lifting graphite, charcoal or

pastel off a drawing. In this regard, it does not smudge or damage work in progress. Repeatedly touching the

putty to a drawing pulls ever more medium free, gradually lightening the work in a controlled fashion. Poster

putty can be shaped into fine points or knife edges, making it ideal for detailed or painstaking work. It can be

rolled across a surface to create visual textures. Poster putty loses its efficacy with use, becoming less tacky as

the material grows polluted with debris and oils from the user's skin.

Electric erasers

The electric eraser has a knob on a short thin rod attached to a motor. The eraser knob turns at a uniform speed,

achieving a smooth erase with a minimum of paper trauma. Electric erasers work quickly and completely.

Soft vinyl erasers

Soft vinyl has plastic texture and erases cleaner than standard erasers. They are softer and non-abrasive, making

them less likely to damage canvas or paper. They are prone to cause smearing when erasing large areas or dark

marks, so these erasers are used to erase light marks and for precision erasing. Engineers favor this type of

eraser for work on technical drawings due to their gentleness on paper.

Other

Felt erasers are used for marks on a chalkboard or whiteboard. Rather than being rubbery or gummy like pencil

erasers, they have a wooden or plastic block with a dark felt pad on one side to erase. The material in these

erasers does not abrade; once they are saturated with chalk or ink, they are cleaned by clapping them against a

hard surface.

Diener Industries manufactured erasers in the shape of toys. In 1955 Walt Disney contacted William Diener to

ask him why souvenir pencils sold in Disneyland were not selling. Diener replied that they were overpriced but

he convinced Disney they be sold with erasers in the shape of Disney characters.[7]

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Erasers that are bundled on certain ballpens and permanent markers can only be used for erasing the ink of their

respective writing instruments.

See also

Ink eraser

Chalkboard eraser

Kneaded eraser

References

^ Teiyûkai (1926). Kôbu daigakkô mukashibanashi (in Japanese). Tokyo: Teiyûkai. pp. 25–26.1.

^ See the footnote on page xv at the end of the preface to the following: Priestley, Joseph (1770). A Familiar

Introduction to the Theory and Practice of Perspective (http://books.google.com/?id=yh4PAAAAQAAJ&

printsec=frontcover&dq=A+Familiar+Introduction+to+the+Theory+and+Practice+of+Perspective). London: J. John

and J. Payne.

2.

^ Joseph Priestley (1769). A Familiar Introduction to the Study of Electricity (http://books.google.com

/books?id=3eFbAAAAQAAJ&pg=PA84). J. Dodsley; T. Cadell, successor to Mr. Millar; and Johnson and Payne.

p. 84.

3.

^ R.B. Simpson (ed.), Rubber Basics, iSmithers Rapra Publishing, 2002, ISBN 185957307X, p.46 "Rubber"4.

^ "Reckendorfer v. Faber 92 U.S. 347 (1875)" (http://supreme.justia.com/us/92/347/case.html). Justia. Retrieved

2014-03-24.

5.

^ http://www.madehow.com/Volume-5/Eraser.html. Missing or empty |title= (help)6.

^ Cole, Benjamin Mark (August 19, 1991). "Terminating errors, promoting images: he's ... Eraserman."

(http://web.archive.org/web/20071027112326/http://www.allbusiness.com/north-america/united-states-california-

metro-areas/253319-1.html). Los Angeles Business Journal. Archived from the original (http://www.allbusiness.com

/north-america/united-states-california-metro-areas/253319-1.html) on Oct 27, 2007. Retrieved 2014-03-24.

7.

Bibliography

Petroski, Henry (1989). The Pencil: A History of Design and Circumstance..

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