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Ferrule. Eraser. A pencil (/ ˈpɛnsəl / ⓘ) 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.
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.
There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart. It was used in some early transistor radio amplifiers with a Class B output stage, allowing the loud speaker to be connected between the amplifier output and the battery center tap.
A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈlɛd /. 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 vast majority of mechanical pencils have erasers.
A new version of the Surface Pen was launched in 2014 with the Surface Pro 3. [6] Based on technology developed by N-trig [7] (a separate company at the time, though subsequently acquired by Microsoft), [8] the Surface Pro 3 version lacks the eraser tip present in the previous generation; erasing is done by drawing over the ink strokes while holding down one of two physical buttons on the side ...
Optical mark recognition (OMR) is the scanning of paper to detect the presence or absence of a mark in a predetermined position. [4] Optical mark recognition has evolved from several other technologies. In the early 19th century and 20th century patents were given for machines that would aid the blind. [2]