Pencil

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PENCIL. An instrument made of plumbago, black lead, red chalk, or other suitable substance, for writing without ink.
     2. It has been holden that a will written with a pencil, could riot, on this account, be annulled. 1 Phillim. R. 1; 2 Phillim. 173.

References in periodicals archive ?
Inspired by pencils on her desk, Mirica had the idea to compress carbon nanotubes into a graphite-like material that could substitute for pencil lead.
With this amount of intellectual firepower, the discovery that started with some Scotch tape and pencil lead is sure to meet a much higher-tech end.
As the pencil lead and test block form different entities, contact modeling was used to transfer load and displacement between the tip of the pencil lead to the test block.
When stacked together, graphene sheets make graphite, which has been commonly used as pencil lead for hundreds of years.
Also it must be noted that both NASA and the Soviets used pencils until 1968, when both sides moved over to using pens because pencil lead could shatter and provide a hazard.
The motor shaft is as thin as pencil lead at only 0.
Another retail vote fraud technique, this one used by vote counters, is "the short pencil"--where a vote counter conceals pencil lead under a fingernail to make additional marks on a ballot in order to invalidate one or more votes by causing "over-votes.
8 mm in diameter, their motor shafts are as thin as a pencil lead.
Chemically, the material is identical to pencil lead.
To make fake dirt, we'll rub the pencil lead against sandpaper," said Tim.
Download a sample pencil lead sheet and Excel lead tracking spreadsheet at biz-comm.
The back of the completed drawing was covered with a heavy coating of pencil lead to create a faux carbon paper.