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A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.
The Blackwing 602 is a pencil that is noted for its soft, dark graphite, unique flat square ferrule and replaceable eraser. It was manufactured by the Eberhard Faber Pencil Company from 1934 to 1988, then by the Faber-Castell pencil company from 1988 to 1994 and by Sanford from 1994 to 1998. [1] The pencil initially sold for 50 cents each.
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.
The Dixon Ticonderoga Company (/ t aɪ k ɒ n d ə ˈ r oʊ ɡ ə /) is an American manufacturer of office and art supplies based in Heathrow, Florida.A subsidiary of Italian-based F.I.L.A. SpA, the company offers a number of brands, with one of the most well-known being Ticonderoga: the yellow No. HB 2 pencil known for its distinctive green and yellow ferrule.
Venus pencils became even more popular after the First World War, which had interrupted the supply of pencil from German companies. In high school many people who used Venus brand pencils saw their slogan "Venus Beats All " which oddly was a reference to the ancient Roman dice game in which the "Venus Roll" was the best possible roll.
The first mark sense scanner was the IBM 805 Test Scoring Machine; this read marks by sensing the electrical conductivity of graphite pencil lead using pairs of wire brushes that scanned the page. In the 1930s, Richard Warren at IBM experimented with optical mark sense systems for test scoring, as documented in US Patents 2,150,256 (filed in ...