The History Of Pencils - PowerPoint PPT Presentation

1 / 4
About This Presentation
Title:

The History Of Pencils

Description:

The origin goes back to 1565, when a substance was found in Borrowdale, England. ... Graphite was cut into narrow sticks and glued between two pieces of wood. ... – PowerPoint PPT presentation

Number of Views:697
Avg rating:3.0/5.0
Slides: 5
Provided by: mfie4
Category:

less

Transcript and Presenter's Notes

Title: The History Of Pencils


1
The History Of Pencils
  • By Michael Fierro

2
Where/How It Started
  • The origin goes back to 1565, when a substance
    was found in Borrowdale, England.
  • In 1761 cabinetmaker Kaspar Faber settled in
    Stein, Germany to make his first simple pencils. 
  • Graphite was cut into narrow sticks and glued
    between two pieces of wood.

3
Improvement
  • In 1794 the Graphite-Clay process was invented.
  • Powdered graphite was mixed with clay, shaped
    into thin rods.
  • The greater the graphite content the softer
    and darker the lead.
  • The greater the clay content the harder
    and lighter the lead.

4
(No Transcript)
Write a Comment
User Comments (0)
About PowerShow.com