Art Tool to Draw Circles With
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 as a pair of compasses, is a technical cartoon musical instrument that can be used for inscribing circles or arcs. Equally dividers, it tin can also be used equally a tool to stride out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes.
Prior to computerization, compasses and other tools for manual drafting were often packaged as a prepare[1] with interchangeable parts. By the mid-twentieth century, circle templates supplemented the use of compasses.[ citation needed ] Today those facilities are more oftentimes provided by computer-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 commonly made of metallic or plastic, and consist of ii "legs" connected by a hinge which can be adapted to allow changing of the radius of the circle drawn. Typically ane leg has a fasten at its end for anchoring, and the other leg holds a cartoon tool, such as a pencil, a short length of merely pencil lead 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 arrow finger and pollex.
Legs [edit]
There are two types of leg in a pair of compasses: the straight or the steady leg and the adaptable i. Each has a split up purpose; the steady leg serves as the basis or back up for the needle betoken, while the adjustable leg can be altered in social club to draw dissimilar sizes of circles.
Hinge [edit]
The spiral through the hinge holds the 2 legs in position. The hinge can be adjusted, depending on desired stiffness; the tighter the hinge-spiral, the more accurate the compass'south performance. The better quality compass, made of plated metal, is able to exist finely adjusted via a pocket-sized, serrated cycle usually set between the legs (see the "using a compass" blitheness shown above) and information technology has a (dangerously powerful) leap encompassing the swivel. This sort of compass is often known as a "pair of Jump-Bow Compasses".
Needle point [edit]
The needle point is located on the steady leg, and serves equally the eye point of the circumvolve that is about to be fatigued.
Pencil lead [edit]
The pencil pb draws the circle on a particular paper or material. Alternatively, an ink beak or attachment with a technical pen may exist used. The meliorate quality compass, made of metallic, has its piece of pencil lead 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 exist made by pushing i leg of the compasses into the paper with the spike, putting the pencil on the newspaper, and moving the pencil around while keeping the legs at the aforementioned angle. Some people who find this action hard often hold the compasses still and move the paper round instead. The radius of the intended circle tin be changed by adjusting the initial angle between the two legs.
Distances can exist measured on a map using compasses with 2 spikes, likewise called a dividing compass (or only "dividers"). The hinge is set in such a way that the altitude 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 can be calculated.
Compasses and straightedge [edit]
Compasses-and-straightedge constructions are used to illustrate principles of plane geometry. Although a existent pair of compasses is used to typhoon visible illustrations, the ideal compass used in proofs is an abstract creator of perfect circles. The most rigorous definition of this abstract tool is the "collapsing compass"; having fatigued a circle from a given betoken with a given radius, it disappears; it cannot simply be moved to another point and used to describe another circle of equal radius (different a real pair of compasses). Euclid showed in his second proposition (Book I of the Elements) that such a collapsing compass could exist used to transfer a distance, proving that a collapsing compass could do anything a real compass can practice.
Variants [edit]
A beam compass is an musical instrument, with a wooden or contumely beam and sliding sockets, cursors or trammels, for drawing and dividing circles larger than those made past a regular pair of compasses.[2]
Scribe-compasses [3] is an instrument used past carpenters and other tradesmen. Some compasses can be used to draw circles, bifurcate angles and, in this case, to trace a line. It is the compass in the most elementary course. Both branches are crimped metal. I 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: first information technology tightens the pencil and secondly information technology locks in the desired altitude when the wing nut is turned clockwise.
Loose leg fly dividers [iv] 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 machine compass or sector, was an instrument used for calculation from the end of the sixteenth century until the nineteenth century. It consists of 2 rulers of equal length joined past a hinge. Dissimilar 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 estimator 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 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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Apartment branch, pivot wing nut, pencil sleeve branch of the scribe-compass.
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6 inch (fifteen 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.
See too [edit]
- Dividers
- Circle
- Geometrography
- Masonic Square and Compasses
- Technical drawing tools
References [edit]
- ^ a electric current vendor'southward 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's 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, April 2007
External links [edit]
- Beam or trammel compass (variant form)
Source: https://en.wikipedia.org/wiki/Compass_%28drawing_tool%29
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