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Not rolling is only one aspect. Line thickness The shape of the pencil also allows the lead to be rectangular. Which allows you to easily draw lines of various thicknesses, simply by rotating the pencil. Stronger core The shape allows for a larger volume of "lead", which increases the strength and reduces breaking. Measuring and spacing If you know ...


According to wikipedia, it's so they don't roll away:: A carpenter pencil (carpentry pencil, carpenter's pencil) is a pencil that has a body with a rectangular or elliptical cross-section to prevent it from rolling away. Carpenter pencils are easier to grip than standard pencils, because they have a larger surface area. The non-round core allows ...


I found this book useful for descriptions of designs for domestic joinery. It also covers regulations where appropriate and has some hints for working practices that I found useful too. Manual of First and Second Fixing Carpentry http://www.amazon.co.uk/Manual-First-Second-Fixing-Carpentry/dp/1856177688

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