Pencils

Many Pencils

across the world and almost all in Europe are graded on the European system using a continuüm from “H” (for hardness) to “B” (for blackness), as well as “F” (for fine point). The standard writing Pencils
 are graded HB. According to Petroski this system might have been developed in the early 1900s by Brookman, an English pencil maker. It used “B” for black and “H” for hard; a Pencils
 grade was described by a sequence or successive Hs or Bs such as BB and BBB for successively softer leads, and HH and HHH for successively harder ones.

Today a set of Pencils
 ranging from a very hard, light-marking pencil to a very soft, black-marking Pencils
 usually ranges from hardest to softest as follows.

This entry was posted on 25/04/2008 at 09:14 am and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response or trackback from your own site.