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www.reference.com/article/invented-mechanical-pencil-c623087f623c5684

The original inventor of the mechanical pencil is up for debate. There are documented references to a lead-holding pencil as early as 1565, and the earliest known version of what is now considered the modern mechanical pencil was found in 1791. There are also many patents for different versions.

www.reference.com/article/cool-mechanical-pencils-c00c28678f7cab5a

The Pilot Dr. Grip Center of Gravity, made with a grip so good that it won an award from the Arthritis Foundation, the Lamy 2000, with its brushed fiberglass-and-stainless steel body, the Rotring 800, with its hexagonal body and the Uniball Kuri Toga, with its auto-rotating mechanism, are some examp

www.reference.com/article/long-pencil-f81faec707ff2164

A typical No. 2 pencil is 7.5 inches long with a 6.75-inch wooden shaft. Most No. 2 pencils are made from cedar with a hexagonal shaft. The lead is a mixture of graphite, clay and wax.

www.reference.com/article/invented-pencil-446e6ed2e62d69a2

Although the exact inventor of the pencil is unknown, Conrad Gesner is often credited with the invention. In 1565, Gesner was the first to document the use of graphite placed in a wooden shaft, which was the predecessor to modern pencils.

www.reference.com/article/pencil-invented-f25df3521d98ea5c

Although no documents state the motivation for the pencil's invention, it was likely first created as an alternative to pens. According to Pencils.com, the first known pencils were developed shortly after the discovery of a graphite deposit in Borrowdale, England, in 1564.

www.reference.com/article/mechanic-93d1cd0934ef3591

A mechanic is most often a trained service professional who inspects, maintains and repairs cars and light trucks. A licensed mechanic may specialize in a number of other fields.

www.reference.com/article/grease-pencil-used-2902909fe3a96faf

Grease pencils are used for writing on surfaces that are nonporous, hard and usually glossy. Some examples of surface materials appropriate for a grease pencil are lacquered maps, glass and ceramics.

www.reference.com/science/length-pencil-7ec15b621b79ea30

The length of a standard number 2 pencil is 7.5 inches, and the pencil has a diameter of about 7 millimeters. Golf, or library, pencils are typically about 3.5 inches long. The most common material used for a pencil's core is graphite.

www.reference.com/science/density-pencil-e33edcfb1b51952e

The density of a pencil varies based on the type of pencil, but it can be found by measuring the pencil's mass, preferably in grams, and then dividing the mass by the volume. The formula for density is density = mass/volume.

www.thebalancesmb.com/best-mechanical-pencils-4160507

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