Tool used for drawing straight lines, or checking their straightness or flatness
For the subculture, see Straight edge.
This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations.(May 2010) (Learn how and when to remove this message)
An ornate 18th century iron straightedge
A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler.
Straightedges are used in the automotive service and machining industry to check the flatness of machined mating surfaces. They are also used in the decorating industry for cutting and hanging wallpaper.[1]
True straightness can in some cases be checked by using a laser line level as an optical straightedge: it can illuminate an accurately straight line on a flat surface such as the edge of a plank or shelf.
A pair of straightedges called winding sticks are used in woodworking to make warping easier to perceive in pieces of wood.
Three straight edges can be used to test and calibrate themselves to a certain extent, however this procedure does not control twist. For accurate calibration of a straight edge, a surface plate must be used.[2]
^"What is a straight edge tool?". Maun Industries. Retrieved April 24, 2023.
^Moore, Wayne R. (1970). Foundations of Mechanical Accuracy (1st, 3rd printing ed.). The Moore Special Tool Company.
A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its...
In geometry, straightedge-and-compass construction – also known as ruler-and-compass construction, Euclidean construction, or classical construction –...
constructed with compass and straightedge. For example, a regular pentagon is constructible with compass and straightedge while a regular heptagon is not...
given circle by using only a finite number of steps with a compass and straightedge. The difficulty of the problem raised the question of whether specified...
Angle trisection is a classical problem of straightedge and compass construction of ancient Greek mathematics. It concerns construction of an angle equal...
length | r | {\displaystyle |r|} can be constructed with compass and straightedge in a finite number of steps. Equivalently, r {\displaystyle r} is constructible...
A straight razor is a razor with a blade that can fold into its handle. They are also called open razors and cut-throat razors. The predecessors of the...
History of Straightedge". Journal of Youth Studies. 2 (2): 133–151. doi:10.1080/13676261.1999.10593032. Wood, Robert T. (2003). "The Straightedge Youth Sub-Culture:...
used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. The...
original on 24 September 2008. Retrieved 28 May 2013. [...] I'm vegan/straightedge still [...] fantano (10 September 2018), LET'S ARGUE: Kamikaze Hurt My...
The Straight Edge Society was a villainous professional wrestling stable in World Wrestling Entertainment (WWE) that appeared on its SmackDown brand. The...
2014). "ACxDC (That's Antichrist Demoncore) Is Here to Bring Vegan Straightedge Satanists Together". Noisey. Vice. Archived from the original on May...
Commonly the instrument is rigid and the edge itself is a straightedge ("ruled straightedge"), which additionally allows one to draw straight lines. Some...
now known to be impossible to construct by using only a compass and straightedge, but even in ancient times solutions were known that employed other methods...
Regardless, their contemporaries considered them Greek. For the most part, straightedge and compass constructions dominated ancient Greek mathematics and most...
bisector: In classical geometry, the bisection is a simple compass and straightedge construction, whose possibility depends on the ability to draw arcs of...
methods for creating them with no more than a compass and an unmarked straightedge. In this sense, Euclidean geometry is more concrete than many modern...
millennia-old problem of squaring the circle cannot be performed with straightedge and compass. With the advent of abstract art in the early 20th century...
instruments used in most geometric constructions are the compass and straightedge. Also, every construction had to be complete in a finite number of steps...
22 = 4. −2 is also a square root of 4, since (−2)2 = 4. Compass-and-straightedge, also known as ruler-and-compass construction, is the construction of...
Compass-and-straightedge construction Constructible point, a point in the Euclidean plane that can be constructed with compass and straightedge Constructible...
compass equivalence theorem is an important statement in compass and straightedge constructions. The tool advocated by Plato in these constructions is...
using straightedge and compass is shown here. Another possible animation of an approximate construction, also possible with using straightedge and compass...
solve the ancient challenge of squaring the circle with a compass and straightedge. The decimal digits of π appear to be randomly distributed, but no proof...
Global Information
