Compass Tool Used to Draw a Circle
A beam compass and a regular compass
A compass with an extension accompaniment for larger circles
A bow compass capable of cartoon the smallest possible circles
A compass, more accurately known equally a pair of compasses, is a technical cartoon instrument that tin can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to step out distances, in particular, on maps. Compasses tin be used for mathematics, drafting, navigation and other purposes.
Prior to computerization, compasses and other tools for manual drafting were often packaged as a set[1] with interchangeable parts. By the mid-twentieth century, circle templates supplemented the use of compasses.[ commendation needed ] Today those facilities are more than often provided by computer-aided design programs, and then the physical tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.
Construction and parts [edit]
Compasses are usually made of metal or plastic, and consist of two "legs" connected by a hinge which can be adjusted to permit changing of the radius of the circle drawn. Typically one leg has a spike at its end for anchoring, and the other leg holds a drawing tool, such as a pencil, a brusk length of but pencil pb or sometimes a pen.
Handle [edit]
The handle, a small knurled rod above the hinge, is normally about half an inch long. Users can grip it between their pointer finger and thumb.
Legs [edit]
There are ii types of leg in a pair of compasses: the direct or the steady leg and the adjustable i. Each has a divide purpose; the steady leg serves every bit the basis or support for the needle point, while the adaptable leg can be altered in social club to draw different sizes of circles.
Hinge [edit]
The screw through the hinge holds the two legs in position. The swivel tin can be adjusted, depending on desired stiffness; the tighter the hinge-spiral, the more authentic the compass'south performance. The better quality compass, made of plated metal, is able to be finely adjusted via a pocket-size, serrated wheel normally set up between the legs (see the "using a compass" animation shown in a higher place) and it has a (dangerously powerful) spring encompassing the hinge. This sort of compass is frequently known as a "pair of Spring-Bow Compasses".
Needle point [edit]
The needle point is located on the steady leg, and serves equally the eye point of the circle that is nearly to exist fatigued.
Pencil pb [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, fabricated of metallic, has its piece of pencil atomic number 82 specially sharpened to a "chisel edge" shape, rather than to a point.
Adjusting nut [edit]
This holds the pencil pb or pen in place.
Uses [edit]
Circles tin can be fabricated past pushing one leg of the compasses into the newspaper with the spike, putting the pencil on the newspaper, and moving the pencil around while keeping the legs at the same angle. Some people who find this action difficult often hold the compasses all the same and motility the newspaper round instead. The radius of the intended circumvolve tin be changed past adjusting the initial angle between the two legs.
Distances tin be measured on a map using compasses with two spikes, also called a dividing compass (or just "dividers"). The swivel is fix in such a fashion that the distance between 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 can be calculated.
Compasses and straightedge [edit]
Compasses-and-straightedge constructions are used to illustrate principles of aeroplane 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 circle from a given point with a given radius, it disappears; it cannot just be moved to another point and used to describe some other circle of equal radius (unlike a real pair of compasses). Euclid showed in his second proposition (Book I of the Elements) that such a collapsing compass could be used to transfer a distance, proving that a collapsing compass could do annihilation 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 fabricated by a regular pair of compasses.[two]
Scribe-compasses [3] is an instrument used by carpenters and other tradesmen. Some compasses can be used to draw circles, bisect angles and, in this case, to trace a line. It is the compass in the most simple grade. 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 fly nut on the hinge serves two purposes: beginning information technology tightens the pencil and secondly information technology locks in the desired altitude when the wing nut is turned clockwise.
Loose leg wing dividers [4] are fabricated of all forged steel. The pencil holder, pollex screws, brass pin and branches are all well built. They are used for scribing circles and stepping off repetitive measurements[five] with some accuracy.
A proportional compass, besides 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 overstate patterns while conserving angles.
Equally a symbol [edit]
A calculator drawn compass, used to symbolize precise designing of applications.
A pair of compasses is often used as a symbol of precision and discernment. As such it finds a place in logos and symbols such equally the Freemasons' Foursquare and Compasses and in various computer 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, pivot fly nut, pencil sleeve co-operative of the scribe-compass.
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6 inch (xv 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 as this pendant.
Come across also [edit]
- Dividers
- Circle
- Geometrography
- Masonic Square and Compasses
- Technical cartoon tools
References [edit]
- ^ a current vendor'due south product
- ^
This article incorporates text from a publication now in the public domain:Chambers, Ephraim, ed. (1728). "Beam-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'south Manifesto, Jeffrey Ehrlich & Marc Mannheimer, Holt, Rhinehart & Winston, pg. 64, 1977
- ^ Fine Woodworking, Laying out dovetails, Chris Gochnour, pg. 31, The Taunton Printing, No. 190, Apr 2007
External links [edit]
- Beam or trammel compass (variant grade)
Source: https://en.wikipedia.org/wiki/Compass_%28drawing_tool%29
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