It Is Used in Drawing Arcs and Circles
A beam compass and a regular compass
A compass with an extension accessory for larger circles
A bow compass capable of drawing the smallest possible circles
A compass, more accurately known every bit a pair of compasses, is a technical drawing instrument that can exist used for inscribing circles or arcs. As dividers, information technology can likewise be used every bit a tool to stride out distances, in item, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes.
Prior to computerization, compasses and other tools for manual drafting were oft packaged as a set[1] with interchangeable parts. By the mid-twentieth century, circumvolve templates supplemented the use of compasses.[ commendation needed ] Today those facilities are more frequently provided by estimator-aided design programs, so the physical tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.
Construction and parts [edit]
Compasses are usually fabricated of metal or plastic, and consist of two "legs" connected by a hinge which tin can be adjusted to let changing of the radius of the circumvolve drawn. Typically one leg has a spike at its end for anchoring, and the other leg holds a cartoon tool, such as a pencil, a short length of only pencil atomic number 82 or sometimes a pen.
Handle [edit]
The handle, a pocket-sized knurled rod in a higher place the hinge, is usually most half an inch long. Users can grip it between their pointer finger and thumb.
Legs [edit]
There are two types of leg in a pair of compasses: the direct or the steady leg and the adjustable one. Each has a separate purpose; the steady leg serves equally the basis or back up for the needle indicate, while the adaptable leg can exist altered in order to depict different sizes of circles.
Hinge [edit]
The spiral through the hinge holds the two legs in position. The hinge can be adjusted, depending on desired stiffness; the tighter the hinge-screw, the more accurate the compass'due south operation. The improve quality compass, fabricated of plated metal, is able to be finely adjusted via a small, serrated wheel usually set between the legs (come across the "using a compass" animation shown higher up) and it has a (dangerously powerful) leap encompassing the swivel. This sort of compass is often known as a "pair of Spring-Bow Compasses".
Needle signal [edit]
The needle betoken is located on the steady leg, and serves as the center point of the circle that is about to be fatigued.
Pencil lead [edit]
The pencil lead draws the circle on a particular paper or material. Alternatively, an ink beak or attachment with a technical pen may be used. The better quality compass, made of metal, has its piece of pencil atomic number 82 specially sharpened to a "chisel border" shape, rather than to a point.
Adjusting nut [edit]
This holds the pencil lead or pen in place.
Uses [edit]
Circles can be made by pushing 1 leg of the compasses into the newspaper with the fasten, putting the pencil on the paper, and moving the pencil effectually while keeping the legs at the same bending. Some people who detect this action difficult often hold the compasses nevertheless and move the paper round instead. The radius of the intended circumvolve can be changed by adjusting the initial angle betwixt the ii legs.
Distances tin can be measured on a map using compasses with ii spikes, too chosen a dividing compass (or just "dividers"). The swivel is set in such a manner that the distance between the spikes on the map represents a certain altitude in reality, and by measuring how many times the compasses fit betwixt two points on the map the distance between those points can be calculated.
Compasses and straightedge [edit]
Compasses-and-straightedge constructions are used to illustrate principles of plane geometry. Although a real pair of compasses is used to draft visible illustrations, the ideal compass used in proofs is an abstruse creator of perfect circles. The most rigorous definition of this abstract tool is the "collapsing compass"; having drawn a circumvolve from a given signal with a given radius, information technology disappears; it cannot but be moved to another point and used to depict another circle of equal radius (unlike a real pair of compasses). Euclid showed in his 2d proffer (Book I of the Elements) that such a collapsing compass could be used to transfer a distance, proving that a collapsing compass could exercise anything a existent compass tin do.
Variants [edit]
A beam compass is an instrument, with a wooden or brass beam and sliding sockets, cursors or trammels, for drawing and dividing circles larger than those made past a regular pair of compasses.[two]
Scribe-compasses [3] is an instrument used past carpenters and other tradesmen. Some compasses can exist used to draw circles, bisect angles and, in this case, to trace a line. It is the compass in the most simple form. Both branches are crimped metal. One branch has a pencil sleeve while the other branch is crimped with a fine betoken protruding from the finish. A wing nut on the hinge serves 2 purposes: first it tightens the pencil and secondly information technology locks in the desired distance when the wing nut is turned clockwise.
Loose leg wing dividers [4] are fabricated of all forged steel. The pencil holder, thumb screws, brass pivot and branches are all well congenital. They are used for scribing circles and stepping off repetitive measurements[5] with some accuracy.
A proportional compass, likewise known as a military compass or sector, was an instrument used for calculation from the end of the sixteenth century until the nineteenth century. It consists of two rulers of equal length joined by a hinge. Different types of scales are inscribed on the rulers that allow for mathematical calculation.
A reduction compass is used to reduce or enlarge patterns while conserving angles.
As a symbol [edit]
A figurer drawn compass, used to symbolize precise designing of applications.
A pair of compasses is often used equally a symbol of precision and discernment. As such it finds a place in logos and symbols such as the Freemasons' Square and Compasses and in diverse computer icons. English poet John Donne used the compass every bit a conceit in "A Valediction: Forbidding Mourning" (1611).
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Compass for tracing a line.
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Apartment branch, pivot wing nut, pencil sleeve branch of the scribe-compass.
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half-dozen inch (15 cm) dividers made from forged steel.
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One type of sector.
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The compass is a Masonic symbol that appears on jewellery such every bit this pendant.
See also [edit]
- Dividers
- Circle
- Geometrography
- Masonic Square and Compasses
- Technical drawing tools
References [edit]
- ^ a electric current vendor's product
- ^
This article incorporates text from a publication now in the public domain:Chambers, Ephraim, ed. (1728). "Axle-Compasses". Cyclopædia, or an Universal Dictionary of Arts and Sciences (1st ed.). James and John Knapton, et al. - ^ Fine Woodworking, Build a Fireplace Mantel, Mario Rodriquez, pgs. 73, 75, The Taunton Printing, No. 184, June 2006
- ^ The Carpenter's Manifesto, Jeffrey Ehrlich & Marc Mannheimer, Holt, Rhinehart & Winston, pg. 64, 1977
- ^ Fine Woodworking, Laying out dovetails, Chris Gochnour, pg. 31, The Taunton Press, No. 190, Apr 2007
External links [edit]
- Beam or trammel compass (variant form)
Source: https://en.wikipedia.org/wiki/Compass_%28drawing_tool%29
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