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Par   •  1 Mars 2020  •  Fiche  •  296 Mots (2 Pages)  •  464 Vues

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  • The invention of the rubber eraser is attributed to the English engineer Edward Nairne ( 1726-1806 )
  • It wasn’t until 1770 that we discovered that a natural rubber made from plants could be used as an eraser. That year, English engineer Edward Nairne accidentally picked up a piece of rubber instead of breadcrumbs and quickly discovered that rubber could erase pencil markings!
  • Edward Naime is a English optician and scientific instrument maker.
  • One of the earliest references to rubber in Europe appears to be in 1770, when Edward Nairne was selling cubes of natural rubber at his shop at 20 Cornhill. The cubes, meant to be erasers, sold for the astonishingly high price of 3 shillings (the shillings is a british-coin) per half-inch cube. Nairne is credited with creating the first rubber eraser. Prior to using rubber, breadcrumbs were used as erasers. Nairne says he inadvertently picked up a piece of rubber instead of breadcrumbs, discovered its erasing properties, and began selling rubber erasers.
  • Vulcanisation: The vulcanization in 1839 it is one to proceed who go allows to modify the use of the rubber which are going to make him not sticky and much more resistant to the cold and has the heat. Produce are easier and more pleasant to use.
  •  Erasers generally consist of three substances: sulphurized rubber, vegetable oil and pumice stone in variable quantity. Erasers the ink have a bigger quantity of pumice than erasers the pencil.
  • Abrasive eraser to erase the ink of typewriter. The first rubber certificate put on the extremity of a pencil is put deposited in 1858 by Marriage Lipman in the United States.There are gums erasers in two colors, blue and pink. The blue, abrasive part, which serves to erase the ink. Eraser rubber made breadcrumbs

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