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Erasers
An eraser (also known as a rubber in some Commonwealth countries, including South Africa from which the material first used got its name) is an article of stationery that is used for removing marks from paper or skin (e.g. parchment or vellum). Erasers have a rubbery consistency and come in a variety of shapes, sizes, and colors. Some pencils have an eraser on one end. Less expensive erasers are made from synthetic rubber and synthetic soy-based gum, but more expensive or specialized erasers are made from vinyl, plastic, or gum-like materials. At first, erasers were invented to erase mistakes made with a pencil; later, more abrasive ink erasers were introduced. The term is also used for things that remove marks from chalkboards and whiteboards. History Before rubber erasers used today, tablets of 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 w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ink Eraser
An ink eraser is an instrument used to scrape away or chemically bleach ink from a writing surface. This is a more involved process than removing pencil markings. Pencil marks can be gradually adhered to natural rubber fragments by rubbing the mark with a pencil eraser (this action is what prompted Joseph Priestley to give solidified latex its Natural rubber, common name). Ink, however, readily penetrates the fibers of most papers and is therefore more difficult to extract by mechanical action. Older ink erasers are therefore small knives designed to scrape off the top few microns of a sheet of paper, removing the ink that had penetrated. In concert with bladed ink erasers, an eraser similar to those at the end of pencils was also used, with additional abrasives, such as sand, mixed into the rubber. Fibreglass ink erasers also work by abrasion. These erasers physically remove the ink and the paper it has marked from the larger sheet. The chemical ink eradicator contains a subst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pencil Eraser
A pencil () is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface. They are distinct from pens, which dispense liquid or gel ink onto the marked surface. Most pencil cores are made of graphite powder mixed with a clay binder. Graphite pencils (traditionally known as "lead pencils") produce grey or black marks that are easily erased, but otherwise resistant to moisture, most solvents, ultraviolet radiation and natural aging. Other types of pencil cores, such as those of charcoal, are mainly used for drawing and sketching. Coloured pencils are sometimes used by teachers or editors to correct submitted texts, but are typically regarded as art supplies, especially those with cores made from wax-based binders that tend to smear when e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Nairne
Edward Nairne (1726 – 1 September 1806) was an English optician and scientific instrument maker. Biography Nairne was born in Sandwich, England. He was apprenticed to the optician Matthew Loft in 1741 and established his own business at 20 Cornhill in London after Loft's death in 1748. In 1774 he took his apprentice Thomas Blunt into partnership, a relationship that lasted until 1793 when Blunt opened his own shop at 22 Cornhill. Nairne patented several electrical machines, including an electrostatic generator consisting of a glass cylinder mounted on glass insulators; the device can supply either positive or negative electricity, and was intended for medicinal use. In the eighth edition of the instruction manual for this device he claimed that "electricity is almost a specific in some disorders, and deserves to be held in the highest estimation for its efficacy in many others". He recommended its use for nervous disorders, bruises, burns, scales, bloodshot eyes, toothache, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vulcanization
Vulcanization (British English: vulcanisation) is a range of processes for hardening rubbers. The term originally referred exclusively to the treatment of natural rubber with sulfur, which remains the most common practice. It has also grown to include the hardening of other (synthetic) rubbers via various means. Examples include silicone rubber via room temperature vulcanizing and chloroprene rubber (neoprene) using metal oxides. Vulcanization can be defined as the curing of elastomers, with the terms 'vulcanization' and 'curing' sometimes used interchangeably in this context. It works by forming cross-links between sections of the polymer chain which results in increased rigidity and durability, as well as other changes in the mechanical and electrical properties of the material. Vulcanization, in common with the curing of other thermosetting polymers, is generally irreversible. The word was suggested by William Brockedon (a friend of Thomas Hancock who attained the B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blackboard
A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, better known as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. Design A blackboard can simply be a board painted with a dark matte (surface), matte paint (usually black, occasionally dark green). Matte black plastic sign material (known as closed-cell PVC foamboard) is also used to create custom chalkboard art. Blackboards on an A-frame are used by restaurants and bars to advertise daily specials. Adhesive chalkboard surface is also available in stores as rolls of textured black plastic shelf covering, which is applied to the desired wall, door or other surface. A more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade blackboards ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymen Lipman
Hymen L. Lipman (c. 1817/1823 – November 4, 1893) is credited with registering the first patent for a pencil with an attached eraser on March 30, 1858 (). Hymen L. Lipman was born March 20, 1817, in either Kingston, Jamaica or in the Bahamas, to English parents. He immigrated to the United States around 1829 with them, arriving in Philadelphia, Pennsylvania, where he resided for the remainder of his life. In 1840, Lipman succeeded Samuel M. Stewart, then the leading stationer in Philadelphia. Three years later, he started the first envelope company in the U.S. In August 7, 1848, he was married to Mary A. Lehman, daughter of Peter Lehman, one of the founders of the Philadelphia College of Pharmacy in Philadelphia. They had a son and two daughters. In 1862, Lipman sold his lead-pencil and eraser patent for $100,000 to Joseph Reckendorfer, who went to sue the pencil manufacturer Faber for infringement. In 1875, the Supreme Court of the United States ruled against Reckendorfer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Curing (chemistry)
Curing is a chemical process employed in polymer chemistry and process engineering that produces the toughening or hardening of a polymer material by cross-linking of polymer chains. Even if it is strongly associated with the production of thermosetting polymers, the term "curing" can be used for all the processes where a solid product is obtained from a liquid solution, such as with PVC plastisols. Curing process During the curing process, single monomers and oligomers, mixed with or without a curing agent, react to form a tridimensional polymeric network. In the very first part of the reaction Branching (polymer chemistry), branches of molecules with various architectures are formed, and their molecular weight increases in time with the extent of the reaction until the network size is equal to the size of the system. The system has lost its solubility and its viscosity tends to infinite. The remaining molecules start to coexist with the macroscopic network until they react wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Goodyear
Charles Goodyear (December 29, 1800 – July 1, 1860) was an American self-taught chemist and manufacturing engineer who developed vulcanized rubber, for which he received patent number 3633 from the United States Patent Office on June 15, 1844. Goodyear is credited with inventing the chemical process to create and manufacture pliable, waterproof, moldable rubber. Goodyear's discovery of the vulcanization process followed five years of searching for a more stable rubber and stumbling upon the effectiveness of heating after Thomas Hancock. His discovery initiated decades of successful rubber manufacturing in the Lower Naugatuck Valley in Connecticut, as rubber was adopted to multiple applications, including footwear and tires. The Goodyear Tire and Rubber Company is named after (though not founded by) him. Early life Charles Goodyear was born on December 29, 1800, in New Haven, Connecticut, the son of Amasa Goodyear, and the oldest of six children. His father was a descenda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Priestley
Joseph Priestley (; 24 March 1733 – 6 February 1804) was an English chemist, Unitarian, Natural philosophy, natural philosopher, English Separatist, separatist theologian, Linguist, grammarian, multi-subject educator and Classical liberalism, classical liberal Political philosophy, political theorist. He published over 150 works, and conducted experiments in several areas of science. Priestley is credited with his independent discovery of oxygen by the thermal decomposition of mercuric oxide, having isolated it in 1774. During his lifetime, Priestley's considerable scientific reputation rested on his invention of carbonated water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen). Priestley's determination to defend phlogiston theory and to reject what would become the chemical revolution eventually left him isolated within the scientific community. Priestley's science was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shilling
The shilling is a historical coin, and the name of a unit of modern currency, currencies formerly used in the United Kingdom, Australia, New Zealand, other British Commonwealth countries and Ireland, where they were generally equivalent to 12 pence or one-twentieth of a Pound (currency), pound before being phased out during the 1960s and 1970s. Currently the shilling is used as a currency in five east African countries: Kenyan shilling, Kenya, Tanzanian shilling, Tanzania, Ugandan shilling, Uganda, Somali shilling, Somalia, and the ''de facto'' country of Somaliland shilling, Somaliland. The East African Community additionally plans to introduce an East African shilling. History The word ''shilling'' comes from Anglo-Saxon language, Anglo-Saxon phrase "Scilling", a monetary term meaning literally "twentieth of a pound", from the Proto-Germanic root :wikt:Reconstruction:Proto-Germanic/skiljaną, skiljaną meaning literally "to separate, split, divide", from :wikt:Reconstr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quechuan Languages
Quechua (, ), also called (, 'people's language') in Southern Quechua, is an indigenous language family that originated in central Peru and thereafter spread to other countries of the Andes. Derived from a common ancestral " Proto-Quechua" language, it is today the most widely spoken pre-Columbian language family of the Americas, with the number of speakers estimated at 8–10 million speakers in 2004,Adelaar 2004, pp. 167–168, 255. and just under 7 million from the most recent census data available up to 2011. Approximately 13.9% (3.7 million) of Peruvians speak a Quechua language. Although Quechua began expanding many centuries before the Incas, that previous expansion also meant that it was the primary language family within the Inca Empire. The Spanish also tolerated its use until the Peruvian struggle for independence in the 1780s. As a result, various Quechua languages are still widely spoken today, being co-official in many regions and the most spoken language in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
