Copass to Draw a Circle
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 than accurately known every bit a pair of compasses, is a technical drawing instrument that tin can be used for inscribing circles or arcs. As dividers, it tin also be used as a tool to step out distances, in item, on maps. Compasses can exist used for mathematics, drafting, navigation and other purposes.
Prior to computerization, compasses and other tools for transmission drafting were often 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 often provided by computer-aided design programs, then the concrete tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.
Structure and parts [edit]
Compasses are unremarkably made of metal or plastic, and consist of 2 "legs" connected past a swivel which can exist adjusted to permit changing of the radius of the circumvolve fatigued. Typically i leg has a spike at its end for anchoring, and the other leg holds a drawing tool, such equally a pencil, a short length of just pencil lead or sometimes a pen.
Handle [edit]
The handle, a small knurled rod above the swivel, is commonly nigh half an inch long. Users tin grip it betwixt their pointer finger and thumb.
Legs [edit]
There are two types of leg in a pair of compasses: the straight or the steady leg and the adaptable one. Each has a separate purpose; the steady leg serves as the footing or support for the needle point, while the adjustable leg can be altered in club to draw different sizes of circles.
Hinge [edit]
The screw through the hinge holds the two legs in position. The hinge tin be adjusted, depending on desired stiffness; the tighter the hinge-screw, the more accurate the compass's performance. The ameliorate quality compass, made of plated metallic, is able to be finely adjusted via a small, serrated bicycle normally set betwixt the legs (see the "using a compass" animation shown higher up) and information technology has a (dangerously powerful) bound encompassing the hinge. This sort of compass is often known as a "pair of Spring-Bow Compasses".
Needle point [edit]
The needle point is located on the steady leg, and serves as the heart point of the circumvolve that is about to exist drawn.
Pencil pb [edit]
The pencil lead draws the circumvolve on a particular newspaper or material. Alternatively, an ink neb or attachment with a technical pen may be used. The better quality compass, made of metal, has its piece of pencil lead specially sharpened to a "chisel edge" shape, rather than to a point.
Adjusting nut [edit]
This holds the pencil atomic number 82 or pen in place.
Uses [edit]
Circles can be fabricated by pushing one leg of the compasses into the paper with the spike, putting the pencil on the newspaper, and moving the pencil effectually while keeping the legs at the aforementioned angle. Some people who notice this action difficult often hold the compasses still and move the paper round instead. The radius of the intended circumvolve tin can be changed by adjusting the initial angle between the two legs.
Distances tin can be measured on a map using compasses with two spikes, also called a dividing compass (or just "dividers"). The hinge is set in such a mode that the distance betwixt the spikes on the map represents a certain distance in reality, and by measuring how many times the compasses fit between two points on the map the distance between those points tin exist 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 abstract creator of perfect circles. The near rigorous definition of this abstruse tool is the "collapsing compass"; having fatigued a circle from a given point with a given radius, information technology disappears; it cannot just exist moved to another indicate and used to draw another circle of equal radius (unlike a real pair of compasses). Euclid showed in his second proposition (Volume I of the Elements) that such a collapsing compass could exist used to transfer a altitude, proving that a collapsing compass could do anything a real compass can 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 by a regular pair of compasses.[two]
Scribe-compasses [3] is an instrument used past carpenters and other tradesmen. Some compasses tin be used to describe circles, bifurcate angles and, in this example, to trace a line. Information technology is the compass in the most simple form. Both branches are crimped metal. One co-operative has a pencil sleeve while the other branch is crimped with a fine point protruding from the end. A wing nut on the hinge serves two purposes: kickoff it tightens the pencil and secondly it locks in the desired distance when the wing nut is turned clockwise.
Loose leg wing dividers [4] are made of all forged steel. The pencil holder, pollex screws, brass pivot and branches are all well built. They are used for scribing circles and stepping off repetitive measurements[5] with some accuracy.
A proportional compass, also known as a armed services compass or sector, was an instrument used for adding from the cease 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 calculator drawn compass, used to symbolize precise designing of applications.
A pair of compasses is oftentimes used as a symbol of precision and discernment. As such it finds a place in logos and symbols such every bit the Freemasons' Square and Compasses and in various estimator icons. English poet John Donne used the compass as a conceit in "A Valediction: Forbidding Mourning" (1611).
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Compass for tracing a line.
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Flat branch, pin fly nut, pencil sleeve branch of the scribe-compass.
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six inch (fifteen cm) dividers made from forged steel.
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Ane type of sector.
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The compass is a Masonic symbol that appears on jewellery such as this pendant.
See also [edit]
- Dividers
- Circle
- Geometrography
- Masonic Foursquare and Compasses
- Technical drawing tools
References [edit]
- ^ a 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 Press, No. 184, June 2006
- ^ The Carpenter'due south 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, April 2007
External links [edit]
- Beam or trammel compass (variant course)
Source: https://en.wikipedia.org/wiki/Compass_(drawing_tool)
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