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A mechanical pencil or clutch pencil is a pencil with a ... as 1.4 and 2.0 mm. The first modern mechanical pencil was ... lead hardness grade indicator set at HB. ...
Pencils in use are usually mechanical pencils with a standard lead thickness. The usual line widths are 0.35 mm, 0.5 mm, 0.7 mm and 1.0 mm. Hardness varies usually from HB to 2H. Softer lead gives a better contrast, but harder lead gives a more accurate line.
Text (produced by an ISO stencil template for use with the technical pens) of 5 mm in height has a stroke or line thickness of 0.5 mm, and so requires a brown-nibbed 0.5 mm pen. If this text were used in an ISO-sized document (e.g. A0), and the document were reproduced at half its original height (A2), the text would be rendered 2.5 mm high ...
A cross section of these barrel styles reflect different ink types. For example, the 3-series barrel is available in ballpoint, gel, mechanical pencil, fountain pen, highlighter, and rollerball pen. All Zebra stainless steel products are refillable, including leads and mechanical pencil erasers.
In 1961, the Bic Orange was introduced, featuring a fine 0.8 mm (0.031 in) point and an orange barrel instead of a translucent one. Bic manufactures this pen in its own plants in Europe. In September 2006, the Bic Cristal was declared the best selling pen in the world after the 100 billionth was sold. [10]
To regulate lettering height, commonly 3 mm (1 ⁄ 8-in), guidelines are drawn. Mechanical lettering is done using tools such as lettering guides, templates, or using a small mechanical pantograph referred to by the Keuffel and Esser trademark "Leroy" Modern drawings are lettered with computer-aided design software.
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