Thing You Draw Circles With
A beam compass and a regular compass
A compass with an extension accompaniment for larger circles
A bow compass capable of drawing the smallest possible circles
A compass, more than accurately known as a pair of compasses, is a technical cartoon instrument that can exist used for inscribing circles or arcs. As dividers, it tin also exist used every bit a tool to step 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 transmission drafting were often packaged as a set[one] with interchangeable parts. By the mid-twentieth century, circle templates supplemented the utilise of compasses.[ citation needed ] Today those facilities are more than oft provided by calculator-aided design programs, and then the concrete tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.
Construction and parts [edit]
Compasses are usually fabricated of metallic or plastic, and consist of two "legs" connected by a swivel which tin be adjusted to allow irresolute of the radius of the circle drawn. Typically 1 leg has a fasten at its stop for anchoring, and the other leg holds a cartoon tool, such as a pencil, a short length of simply pencil pb or sometimes a pen.
Handle [edit]
The handle, a small knurled rod above the hinge, is usually about half an inch long. Users can grip information technology between their pointer finger and thumb.
Legs [edit]
In that location are two types of leg in a pair of compasses: the straight or the steady leg and the adaptable i. Each has a split purpose; the steady leg serves as the basis or support for the needle point, while the adjustable leg tin can be altered in order to depict unlike sizes of circles.
Hinge [edit]
The screw through the swivel holds the two legs in position. The hinge can be adjusted, depending on desired stiffness; the tighter the swivel-screw, the more than authentic the compass's functioning. The better quality compass, made of plated metallic, is able to be finely adjusted via a small-scale, serrated bike ordinarily set between the legs (see the "using a compass" animation shown higher up) and information technology has a (dangerously powerful) jump encompassing the swivel. This sort of compass is often known as a "pair of Leap-Bow Compasses".
Needle betoken [edit]
The needle betoken is located on the steady leg, and serves equally the center point of the circumvolve that is nigh to be drawn.
Pencil lead [edit]
The pencil lead draws the circle on a detail paper or fabric. Alternatively, an ink bill 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 edge" shape, rather than to a signal.
Adjusting nut [edit]
This holds the pencil lead or pen in identify.
Uses [edit]
Circles can be made by pushing one leg of the compasses into the paper with the spike, putting the pencil on the paper, and moving the pencil effectually while keeping the legs at the same angle. Some people who discover this action difficult oftentimes hold the compasses still and move the paper round instead. The radius of the intended circle can be changed by adjusting the initial bending between the two legs.
Distances can exist measured on a map using compasses with two spikes, as well called a dividing compass (or just "dividers"). The hinge is ready in such a way that the distance betwixt the spikes on the map represents a sure 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 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 well-nigh rigorous definition of this abstract tool is the "collapsing compass"; having fatigued a circle from a given bespeak with a given radius, information technology disappears; it cannot but be moved to some other point and used to describe another circle of equal radius (unlike a real pair of compasses). Euclid showed in his second proffer (Book I of the Elements) that such a collapsing compass could be used to transfer a altitude, proving that a collapsing compass could do anything a real compass tin can do.
Variants [edit]
A beam compass is an instrument, with a wooden or brass axle and sliding sockets, cursors or trammels, for cartoon and dividing circles larger than those made by a regular pair of compasses.[2]
Scribe-compasses [iii] 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 class. Both branches are crimped metal. One branch has a pencil sleeve while the other co-operative is crimped with a fine point protruding from the finish. A wing nut on the hinge serves two purposes: first it tightens the pencil and secondly it locks in the desired altitude when the wing nut is turned clockwise.
Loose leg wing dividers [4] are made of all forged steel. The pencil holder, thumb 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 military compass or sector, was an musical instrument used for adding from the terminate 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 computer drawn compass, used to symbolize precise designing of applications.
A pair of compasses is frequently used as 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 various calculator 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 wing nut, pencil sleeve branch of the scribe-compass.
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6 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 as this pendant.
Run into also [edit]
- Dividers
- Circumvolve
- Geometrography
- Masonic Square and Compasses
- Technical drawing tools
References [edit]
- ^ a current vendor's product
- ^
This commodity incorporates text from a publication at present in the public domain:Chambers, Ephraim, ed. (1728). "Beam-Compasses". Cyclopædia, or an Universal Lexicon 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'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, April 2007
External links [edit]
- Axle or trammel compass (variant form)
Source: https://en.wikipedia.org/wiki/Compass_%28drawing_tool%29
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