The propelling pencil is a mechanical writing instrument with a thin, cylindrical sleeve.  This pencil is used by professional artists for drafting and sketching.  They also have a slim design that is comfortable to hold. A mechanical pencil uses a complicated mechanism that has been tested for yea...

1. First prepare a piece of toothpaste and a towel, wet the towel first, and then put the towel into a basin of water. Wet the towel and wring it out slightly. Squeeze the toothpaste onto the wet towel. The amount of toothpaste can be controlled according to the crayon marks to prevent unnecessary w...

One late night in 1888, American journalist John Lauder held a pen in his hand to conceive his own article that should be handed over to his boss tomorrow. As John wrote his letter, the sharp tip of the pen scratched his manuscript paper. John had to write again. When he wrote again, the pen ran out...

A mechanical pencil is a type of pencil that has a button on the end. It looks like a ballpoint pen, but is made of different materials. It's a great option for architects, draftsmen and people who need flexibility. The components of a mechanical pencil are usually made from a combination of high c...