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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.
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]
The fixed piece forms an ordinary parallel ruler, with the sliding piece extended out to form a ruler at an angle. The link to this ruler can also slide, allowing the angle of the ruler to shift so that it always intersects the vanishing point. To use Nicholson's centrolinead, two lines converging at the vanishing point must already be drawn.
Today electronic computers or calculators are used. Other traditional aids used included tables (trigonometric, logarithms, etc.) and slide rules. Dividers used for measuring lengths of lines and approximate lengths of non-linear paths on a chart. Nautical almanac used to determine the position in the sky of a celestial body after a sight has ...
View of a drafting table: the old way of producing architectural and engineering drawings. On the top of the board is a parallel ruler. Rulers and templates Various curved templates, commonly known as French curves. This image comes from the Lexikon der gesamten Technik (dictionary of technology) from 1904 by Otto Lueger
A drafting machine is a tool used in technical drawing, consisting of a pair of scales mounted to form a right angle on an articulated protractor head that allows an angular rotation. [ 1 ] [ 2 ] The protractor head (two scales and protractor mechanism) is able to move freely across the surface of the drawing board , sliding on two guides ...