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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 use.The vast majority of mechanical pencils have ...
He became renowned for further development of the mechanical pencil (1906) [4] - then called an "automatic pencil" - and the first solid-ink fountain pen (1907). [5] On 24 January 1906 he registered the patent for an automatic pencil.
Mechanical pencils have more elaborate casings which are not bonded to the core; instead, they support separate, mobile pigment cores that can be extended or retracted (usually through the casing's tip) as needed. These casings can be reloaded with new cores (usually graphite) as the previous ones are exhausted.
A type of mechanical pencil has a rotating gear mechanism which rotates the lead slightly every time the lead is lifted off the paper, helping to maintain a consistent, sharp point. If a finer or broader line is needed, a separate mechanical pencil using a lead with a different diameter is required.
Penkala's mechanical pencil was a stroke of genius. Crafted with thin graphite leads embedded in a metal holder, it boasted a spiral mechanism within the outer casing. This ingenious feature allowed users to effortlessly extend the lead as needed by simply rotating the pen.
23 lip 2024 · A mechanical pencil is a writing instrument with a replaceable, extendable solid pigment core, called ‘lead’. Mechanical pencils have a refillable lead mechanism, eliminating the need for sharpening. This design has earned them various names worldwide, including: microtip pencils. automatic pencils. drafting pencils. propelling pencils
In 1906 Slavoljub Penkala patented a mechanical pencil called Penkala, and in the same year he opened his first shop in what is today Praška Street. This was where the mechanical pencil and the fountain pen started their world trip…
