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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.
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] Using larger distances on a ruler to draw lines smaller distances apart means that ...
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
Nocturnal used to determine apparent local time by viewing the Polaris and its surrounding stars. Ring dial or astronomical ring used to measure the height of a celestial body above the horizon. It could be used to find the altitude of the Sun or determine local time. It let sunlight shine through a small orifice on the rim of the instrument.
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.
The most common form consists of an L-shaped stock with the blade fixed on top bisecting the stock. [4] Another type is made from a single piece of metal with two perpendicular pins which are placed against the edge of the workpiece. [5] [6] Centre squares are also manufactured to be used as a head for a combination square. [7]