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A typical construction of a ratchet-based mechanical pencil. 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 ...
Lead for mechanical pencils Flexible pencils. Mechanical pencils use mechanical methods to push lead through a hole at the end. These can be divided into two groups: with propelling pencils an internal mechanism is employed to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is ...
It was founded by German immigrant, Ludwig Brenner, [1] to produce his patent propelling pencils which contained twelve three inch leads (that is to say, 36 inches or a yard of lead). Originally based in Premier House, 12-13 Hatton Garden, London, the company moved in the late 1940s to 1 Great Cumberland Place, London.
Lead pencil may refer to: Pencil , a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing Mechanical pencil , a pencil with mechanically extendable solid pigment core called a lead
At the 1889 World Fair in Paris, the Hardtmuths displayed their pencils rebranded as "Koh-I-Noor Hardtmuth". Each pencil was encased in a yellow cedar -wood barrel. The inspiration for the name was the Koh-i-Noor diamond (Persian for "Mountain of Light"), part of the Crown Jewels of the United Kingdom, and the largest diamond in the world at ...
A pencil sharpener (or pencil pointer, or in Ireland a parer or topper [1]) is a tool for sharpening a pencil's writing point by shaving away its worn surface. Pencil sharpeners may be operated manually or by an electric motor. It is common for many sharpeners to have a casing around them, which can be removed for emptying the pencil shavings ...
That same year Rotring launched its first drawing board, and the "Tikky" mechanical pencil was released in 1979. The "Art Pen", a fountain pen suitable for calligraphy, was launched in 1984. During the decade, Rotring set new subsidiaries in other European countries, while the "600" mechanical pencil was introduced in 1989.
A mechanism employed in the DelGuard system developed by Zebra, causes the lead sleeve in a mechanical pencil to extend outward when excessive pressure is applied at an angle. When excess vertical pressure is applied on the lead, the lead is automatically retracted inwards. Thus, the lead is protected (within certain limits) in both cases.
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