One of the mysteries of the English language finally explained.
An instrument for drawing parallel lines, consisting of two or more rulers connected by jointed crosspieces so as to be always parallel, at whatever distance they are set.
- ‘A parallel ruler was used to transfer angular bearings from prominent coastal features in georeferenced SAR images of various scales to the same features on outline maps.’
- ‘This folding parallel ruler provides a fast, accurate method of drawing lines parallel to any reference line.’
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