Domestic & Everyday Machines
Mechanical pencil
A mechanical pencil holds a replaceable graphite lead and advances it through a small mechanism. Screw, clutch and push-button systems maintain a usable point without sharpening a wooden casing.
About this artifact
A mechanical pencil holds a replaceable graphite lead and advances it through a small mechanism. Screw, clutch and push-button systems maintain a usable point without sharpening a wooden casing.
Sources & image credits
Documented image of this machine or its operating principle; see image credits for the original date and subject.
Image: Mechanical_Pencil_Diagram.svg
Creator: Pbroks13
License: CC BY-SA 4.0
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