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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.
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.
Marquois scales in a case of drawing instruments (top) and on their own (bottom) Marquois scales (also known as Marquois parallel scales or Marquois scale and triangle or military scales) are a mathematical instrument that found widespread use in Britain, particularly in military surveying, from the late 18th century to World War II.
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 ...
Parallel rules used for transferring a line to a parallel position. Also used to compare the orientation of a line to a magnetic or geographic orientation on a compass rose . Direct measuring