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2012-05-21 23:00:15

How EGC Developed a Flexible Graphite Bonnet Seal that Consumes Less Time and Provided Real Cost Savings to Power Plants During Regularly Scheduled Maintenance. Chardon,


Latest Art materials Reference Libraries

45_08f9f5837a2b81fbee66f11994590f51
2010-09-16 16:05:54

A pencil, containing a solid pigment core within a protective casing, is a common writing implement or art medium. Having a case keeps the pigment from breaking as well as from marking the user's hand. Pencils differ from pens because they leave marks by physical abrasion rather than staining the paper. The pigment leaves behind a trail of material that adheres to the sheet of paper or other writing surface. Cores are usually made of graphite mixed with clay to bind it. Graphite is durable...

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Word of the Day
pawl
  • A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.
The word 'pawl' probably comes from a Latin word meaning 'stake'.
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