Pencil has been the most widely used object of all people. From kids to adults, teachers to engineers, male or female, pencil has been a part of our lives. The history of pencils can be traced back thousand years ago. It was the Romans who coined the phrase pencil. They actually called a tiny brush that they called a "pencillus".
Between 1822 and 1874, more than 160 patents were registered pertaining to a variety of improvements to mechanical pencils. The first spring-loaded mechanical pencil was patented in 1877 and a twist-feed mechanism was developed in 1895. In 1913, Charles R. Keeran introduced the world's first mass-produced mechanical pencil: the Eversharp Pencil.
A mechanical pencil is a writing instrument in which the lead is not bonded to the outer casing, and is designed such that the core is to be extended as its point is worn away. Mechanical pencils are designed and used to provide lines of constant thickness without requiring sharpening, that makes them perfect for technical drawing and fine line
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