Rolling ruler
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A rolling ruler is a ruler that contains a cylinder much like a rolling pin inside, thereby enabling it to "roll" along a sheet of paper or other surface where it is being used. A rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a protractor and compass.[1][2]
[edit] References
- ^ Jack E. Ingels (2003). "Using Drawing Instruments". Landscaping: Principles and Practices. Cengage Learning. pp. 11. ISBN 1401834108.
- ^ Jim Tolpin (2007). "drawing techniques". Measure Twice, Cut Once. Popular Woodworking Books. pp. 24. ISBN 155870809X.
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