“ Thing we need every day : Pencils. ”
Pencil is the important thing we need every day. We use a pencil to write, record and drawing.
Pencil consists of pencil cores and pencil. Most pencil cores are made of graphite .
The wood used to manufacture pencils must be able to withstand repeated sharpening and cut easily without splintering. Most pencils are made from cedar.(specifically, California cedar)
Process beginning with the piece of wood prepared to wear a long groove. Then drops glue down. And hauling wood to mesh together like a sandwich. Then they went into the oven dried .
The wood was produced by industry process and it become to the thin slats after that wood was made to be a pencil.
Winrich Pencil Lead
The center of the pencil -- known as the writing core "lead" -- is made of a nontoxic mineral called graphite. Today's writing cores are a mixture of graphite and clay. By varying the ratio of graphite to clay, pencil makers can adjust the "hardness" of the writing core. The hardness of the core is often marked on the pencil -- look for a number (such as "2" or "3"). The higher the number the harder the writing core. You might see other markings on pencils. Some pencil manufacturers use the letter "H" to indicate a hard pencil. Likewise, a pencil maker might use the letter "B" to designate the blackness of the pencil's mark. The letter "F" is also used to indicate that the pencil sharpens to a fine pont. Pencil makers also use combinations of letters -- a pencil marked "HB" is hard and black; a pencil marked "HH" is very hard, and a pencil marked "HHBBB" is very hard and really, really black!