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 ...

Now, in a recent study, researchers from Japan found a simple and low-cost way of tuning the reflectance spectra of pencil lead samples using plasma. Their technique enabled them to produce pencil ...

National Museum of American History pencil, packaged set National Museum of American History Box of American Lead Pencil Co. Venus Pencils National Museum of American History Wallace Pencil Company ...

The Wingback Designer’s mechanical pencil pairs a Japanese mechanism with a British-engineered brass case, creating a pleasingly weighted writing device. The integral reservoir has been designed to ...