Twist-Erase III Mechanical Pencils feature a sturdy ... grip delivers maximum comfort and control With the jumbo Twist-Up Eraser, you'll suffer no smudges, no paper tears and no ghosts Each ...

The pencil “lead” is actually a mixture of graphite and clay. More clay in the mixture makes the lead harder. A harder lead has a higher number. Pencils are numbered from 1-3 but most people use a ...

Soft, crustless bread was also used to wipe away pencil markings. It was around 1770 when things got more rubbery. The engineer Edward Nairne was responsible for the first widely available eraser ...

Although flat and oval shaped, their first use was carpentry. The eraser was then added in 1858 by Hymen Lipman who patented the idea. Creating different hardness' to pencils was discovered by ...

[Franklinstein] however decided to design a high-speed eraser integrated into a mechanical pencil that brings the ... you might want to first read our primer on small DC motors.