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2. Parallel rulers - Wikipedia

   en.wikipedia.org/wiki/Parallel_rulers

   Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.

3. Marquois scales - Wikipedia

   en.wikipedia.org/wiki/Marquois_scales

   A line is drawn along the beveled edge (the side of middle-length) of the triangle. By placing a ruler against the hypotenuse of the triangle and sliding the triangle along the ruler for 3 units of the ruler's scale, drawing another line along the beveled edge results in a parallel line with a distance of only 1 unit from the original line. [2]

4. Constructions in hyperbolic geometry - Wikipedia

   en.wikipedia.org/wiki/Constructions_in...

   A parallel ruler can be used to draw a line through a given point A and parallel to a given ray a [3]. For any two lines, a hyperbolic ruler can be used to construct a line that is parallel to the first line and perpendicular to the second. [3] A few notes on the uses of rulers are:

5. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   Rulers may also be used as a support for separate special rulers and letter templates. The rules are replaceable and they can be for example scale-rules. Drawing apparatus has evolved from a drawing board mounted parallel ruler and a pantograph, which is a device used for copying objects in an adjustable ratio of sizes.

6. Centrolinead - Wikipedia

   en.wikipedia.org/wiki/Centrolinead

   Nicholson's centrolinead is a modification of a pair of parallel rulers. The bar farthest from the vanishing point can be lengthened, being composed of a fixed piece and a sliding piece pinned together. The fixed piece forms an ordinary parallel ruler, with the sliding piece extended out to form a ruler at an angle.

7. Rolling ruler - Wikipedia

   en.wikipedia.org/wiki/Rolling_ruler

   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 .